The total monthly incomes of 21 men is $124200.
37 of them earn the same monthly income each. Each of the remaining men earns 5 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 |
9 |
12 |
|
Value |
1 u |
5 u |
|
Total value |
9 u |
60 u |
69 u |
Number of men with lower incomes
=
37 x 21
= 9
Number of men with higher incomes
= 21 - 9
= 12
Total monthly incomes
= 9 u + 60 u
= 69 u
69 u = 124200
1 u = 124200 ÷ 69 = 1800
Difference between the higher monthly income and the lower monthly income
= 5 u - 1 u
= 4 u
= 4 x 1800
= $7200
Answer(s): $7200