Bao saved $179 a month. he saved $145 less than ada each month. how much would ada save in three and a half years?

If i am correct, the answer should be 13608.
To find out how much Ada saved a month, we would need to add 179 and 145, that equals 324. Then we would need to multiply that by 12 because there are 12 months in a year. We would get 3888. Then we would need to multiply that by 3, since there are 3 years. We would get 11664. Then we would need to multiply 324 and 6 for 324 dollars a month. That gives us 1944. Then we add 1944 and 11664, we get 13608. :)