The task is to generate the correct answer for a given math problem.

Input: Consider Input: Problem: find the cost of fencing around a circular field of diameter 16 m at the rate of rs . 3 a meter ?

Output: 150.84

Input: Consider Input: Problem: when a merchant imported a certain item , he paid a 7 percent import tax on the portion of the total value of the item in excess of $ 1,000 . if the amount of the import tax that the merchant paid was $ 94.50 , what was the total value of the item ?

Output: $ 2,350

Input: Consider Input: Problem: 120 kg of an alloy a is mixed with 180 kg of alloy b . if alloy a has lead and tin in the ratio 2 : 3 and alloy b has tin and copper in the ratio 3 : 5 , then the amount of tin in the new alloy is ?
Output: 139.5 kg