You are given a math word problem and you are supposed to apply multiplication or division mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

Input: Consider Input: David had 4000 dollars invested for 0.25 of a year at a simple rate of 6.1 % . How much interest did he earn ?

Output: 61

Input: Consider Input: Mike had 15 video games but 9 of them were n't working . If he wanted to sell the working games for $ 5 each , how much money could he earn ?

Output: 30

Input: Consider Input: A sandbox is 312 centimeters long and 146 centimeters wide . How many square centimeters of ground does the sandbox cover ?
Output: 45552