The total monthly incomes of 21 men is $72600.
57 of them earn the same monthly income each. Each of the remaining men earns 3 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 |
15 |
6 |
|
Value |
1 u |
3 u |
|
Total value |
15 u |
18 u |
33 u |
Number of men with lower incomes
=
57 x 21
= 15
Number of men with higher incomes
= 21 - 15
= 6
Total monthly incomes
= 15 u + 18 u
= 33 u
33 u = 72600
1 u = 72600 ÷ 33 = 2200
Difference between the higher monthly income and the lower monthly income
= 3 u - 1 u
= 2 u
= 2 x 2200
= $4400
Answer(s): $4400