TASK DEFINITION: The task is to generate the correct answer for a given math problem.
PROBLEM: Problem: 30 pens and 75 pencils were purchased for 750 . if the average price of a pencil was 2.00 , find the average price of a pen .

SOLUTION: 20

PROBLEM: Problem: a customer went to a shop and paid a total of $ 40 , out of which $ 1.28 was for sales tax on taxable purchases . if the tax rate was 8 % , then what was the cost of the tax free items ?

SOLUTION: $ 22.72

PROBLEM: Problem: a fair 2 sided coin is flipped 4 times . what is the probability that tails will be the result at least twice , but not more than 4 times ?

SOLUTION:
5 / 8