The total monthly incomes of 21 men is $171000.
37 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 |
9 |
12 |
|
Value |
1 u |
4 u |
|
Total value |
9 u |
48 u |
57 u |
Number of men with lower incomes
=
37 x 21
= 9
Number of men with higher incomes
= 21 - 9
= 12
Total monthly incomes
= 9 u + 48 u
= 57 u
57 u = 171000
1 u = 171000 ÷ 57 = 3000
Difference between the higher monthly income and the lower monthly income
= 4 u - 1 u
= 3 u
= 3 x 3000
= $9000
Answer(s): $9000