The total monthly incomes of 21 men is $81600.
27 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 |
6 |
15 |
|
Value |
1 u |
3 u |
|
Total value |
6 u |
45 u |
51 u |
Number of men with lower incomes
=
27 x 21
= 6
Number of men with higher incomes
= 21 - 6
= 15
Total monthly incomes
= 6 u + 45 u
= 51 u
51 u = 81600
1 u = 81600 ÷ 51 = 1600
Difference between the higher monthly income and the lower monthly income
= 3 u - 1 u
= 2 u
= 2 x 1600
= $3200
Answer(s): $3200