The total monthly incomes of 21 men is $68400.
47 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 |
12 |
9 |
|
Value |
1 u |
5 u |
|
Total value |
12 u |
45 u |
57 u |
Number of men with lower incomes
=
47 x 21
= 12
Number of men with higher incomes
= 21 - 12
= 9
Total monthly incomes
= 12 u + 45 u
= 57 u
57 u = 68400
1 u = 68400 ÷ 57 = 1200
Difference between the higher monthly income and the lower monthly income
= 5 u - 1 u
= 4 u
= 4 x 1200
= $4800
Answer(s): $4800