I'm trying to figure out, how to solve this problem, I'm sorry about my english, I've tryed to do my best to translate the problem properly.
Mr. A as deposited a given amount, on a anual tax of 7%. After 6 months, Mr B deposited more $1200 then Mr A, but on an anual tax of 9%. After 18 months from the first aplication (by Mr A), Mr B recieved an interested of $27,75 more then Mr A
Considering Simple Interest regime, determinate how much was deposited by each one
Any sugestion is appreciated! Tks!