The total monthly incomes of 20 men is $81600.
25 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 |
8 |
12 |
|
Value |
1 u |
5 u |
|
Total value |
8 u |
60 u |
68 u |
Number of men with lower incomes
=
25 x 20
= 8
Number of men with higher incomes
= 20 - 8
= 12
Total monthly incomes
= 8 u + 60 u
= 68 u
68 u = 81600
1 u = 81600 ÷ 68 = 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