The total monthly incomes of 30 men is $243600.
25 of them earn the same monthly income each. Each of the remaining men earns 4 times as much per month. Find the difference between the higher monthly income and the lower monthly income.
|
Men with lower incomes |
Men with higher incomes |
Total incomes |
Number |
12 |
18 |
|
Value |
1 u |
4 u |
|
Total value |
12 u |
72 u |
84 u |
Number of men with lower incomes
=
25 x 30
= 12
Number of men with higher incomes
= 30 - 12
= 18
Total monthly incomes
= 12 u + 72 u
= 84 u
84 u = 243600
1 u = 243600 ÷ 84 = 2900
Difference between the higher monthly income and the lower monthly income
= 4 u - 1 u
= 3 u
= 3 x 2900
= $8700
Answer(s): $8700