The total monthly incomes of 28 men is $105600.
27 of them earn the same monthly income each. Each of the remaining men earns 4 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 |
20 |
|
Value |
1 u |
4 u |
|
Total value |
8 u |
80 u |
88 u |
Number of men with lower incomes
=
27 x 28
= 8
Number of men with higher incomes
= 28 - 8
= 20
Total monthly incomes
= 8 u + 80 u
= 88 u
88 u = 105600
1 u = 105600 ÷ 88 = 1200
Difference between the higher monthly income and the lower monthly income
= 4 u - 1 u
= 3 u
= 3 x 1200
= $3600
Answer(s): $3600