The total monthly incomes of 28 men is $122400.
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 |
8 |
20 |
|
Value |
1 u |
3 u |
|
Total value |
8 u |
60 u |
68 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 + 60 u
= 68 u
68 u = 122400
1 u = 122400 ÷ 68 = 1800
Difference between the higher monthly income and the lower monthly income
= 3 u - 1 u
= 2 u
= 2 x 1800
= $3600
Answer(s): $3600