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At 30% normal accuracy (15% with rapid fire), the two will do the same amount of damage, on average. At 29% normal accuracy, a normal attack will do more. At 31% accuracy, a rapid fire attack will do more.

X-Axis = Chance to hit with Normal Fire
Y-Axis = Average Damage per Ability Use (assuming 10 damage per successful hit)

Assuming you do 10 damage per hit:

• At 29% normal accuracy, you will do 2.9 damage per normal fire on average, and rapid fire will do 2.8 (24.08% chance to hit once, or 1.96% chance to hit twice, averaged with 10 damage per hit).
• At 30% accuracy, both will do 3 damage per ability use on average.
• At 31% accuracy, a normal attack will do 3.1 average damage, while a rapid fire attack will do 3.2 damage average.

Here is a spreadsheet where I did the calculations.

At 30% normal accuracy (15% with rapid fire), the two will do the same amount of damage, on average. At 29% normal accuracy, a normal attack will do more. At 31% accuracy, a rapid fire attack will do more.

X-Axis = Chance to hit with Normal Fire
Y-Axis = Average Damage per Ability Use (assuming 10 damage per successful hit)

Assuming you do 10 damage per hit:

• At 29% normal accuracy, you will do 2.9 damage per normal fire on average, and rapid fire will do 2.8 (24.08% chance to hit for 10 damage plus 1.96% chance to hit for 20 damage).
• At 30% accuracy, both will do 3 damage per ability use on average.
• At 31% accuracy, a normal attack will do 3.1 average damage, while a rapid fire attack will do 3.2 average damage.

Here is a spreadsheet where I did the calculations.

At 30% normal accuracy (15% with rapid fire), the two will do the same amount of damage, on average. At 29% normal accuracy, a normal attack will do more. At 31% accuracy, a rapid fire attack will do more.

X-Axis = Chance to hit with Normal Fire
  Y-Axis = Average Damage per Ability Use

Assuming you do 10 damage per hit:

• At 29% normal accuracy, you will do 2.9 damage per normal fire on average, and rapid fire will do 2.8 (24.08% chance to hit once, or 1.96% chance to hit twice, averaged with 10 damage per hit).
• At 30% accuracy, both will do 3 damage per ability use on average.
• At 31% accuracy, a normal attack will do 3.1 average damage, while a rapid fire attack will do 3.2 damage average.

Here is a spreadsheet where I did the calculations.

At 30% normal accuracy (15% with rapid fire), the two will do the same amount of damage, on average. At 29% normal accuracy, a normal attack will do more. At 31% accuracy, a rapid fire attack will do more.

 
X-Axis = Chance to hit with Normal Fire  
Y-Axis = Average Damage per Ability Use (assuming 10 damage per successful hit)

Assuming you do 10 damage per hit:

• At 29% normal accuracy, you will do 2.9 damage per normal fire on average, and rapid fire will do 2.8 (24.08% chance to hit once, or 1.96% chance to hit twice, averaged with 10 damage per hit).
• At 30% accuracy, both will do 3 damage per ability use on average.
• At 31% accuracy, a normal attack will do 3.1 average damage, while a rapid fire attack will do 3.2 damage average.

Here is a spreadsheet where I did the calculations.

At 30% normal accuracy (15% with rapid fire), the two will do the same amount of damage, on average. At 29% normal accuracy, a normal attack will do more. At 31% accuracy, a rapid fire attack will do more.

X-Axis = Chance to hit with Normal Fire

Y-Axis = Average Damage per Ability Use

Assuming you do 10 damage per hit:

• At 29% normal accuracy, you will do 2.9 damage per normal fire on average, and rapid fire will do 2.8 (24.08% chance to hit once, or 1.96% chance to hit twice, averaged with 10 damage per hit).
• At 30% accuracy, both will do 3 damage per ability use on average.
• At 31% accuracy, a normal attack will do 3.1 average damage, while a rapid fire attack will do 3.2 damage average.

Here is a spreadsheet where I did the calculations.

At 30% normal accuracy (15% with rapid fire), the two will do the same amount of damage, on average. At 29% normal accuracy, a normal attack will do more. At 31% accuracy, a rapid fire attack will do more.

X-Axis = Chance to hit with Normal Fire
Y-Axis = Average Damage per Ability Use

Assuming you do 10 damage per hit:

• At 29% normal accuracy, you will do 2.9 damage per normal fire on average, and rapid fire will do 2.8 (24.08% chance to hit once, or 1.96% chance to hit twice, averaged with 10 damage per hit).
• At 30% accuracy, both will do 3 damage per ability use on average.
• At 31% accuracy, a normal attack will do 3.1 average damage, while a rapid fire attack will do 3.2 damage average.

Here is a spreadsheet where I did the calculations.