The total monthly incomes of 25 men is $143000.
35 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 |
15 |
10 |
|
| Value |
1 u |
4 u |
|
| Total value |
15 u |
40 u |
55 u |
Number of men with lower incomes
=
35 x 25
= 15
Number of men with higher incomes
= 25 - 15
= 10
Total monthly incomes
= 15 u + 40 u
= 55 u
55 u = 143000
1 u = 143000 ÷ 55 = 2600
Difference between the higher monthly income and the lower monthly income
= 4 u - 1 u
= 3 u
= 3 x 2600
= $7800
Answer(s): $7800
