In an account, m dollars decreases by 20% each year for the next

In an account, m dollars decreases by 20% each year for the next two years. In another account, n dollars increases by 20% each year for the next two years. If the sum of the two amount at the end of two years is 100 dollars, what is the value of 4m+9n? a. 6.25 b. 62.5 c. 625 d. 6250 e. Cannot (…)