The total monthly incomes of 21 men is $89100.
27 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 |
6 |
15 |
|
Value |
1 u |
5 u |
|
Total value |
6 u |
75 u |
81 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 + 75 u
= 81 u
81 u = 89100
1 u = 89100 ÷ 81 = 1100
Difference between the higher monthly income and the lower monthly income
= 5 u - 1 u
= 4 u
= 4 x 1100
= $4400
Answer(s): $4400