The total monthly incomes of 30 men is $158400.
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 |
18 |
12 |
|
Value |
1 u |
4 u |
|
Total value |
18 u |
48 u |
66 u |
Number of men with lower incomes
=
35 x 30
= 18
Number of men with higher incomes
= 30 - 18
= 12
Total monthly incomes
= 18 u + 48 u
= 66 u
66 u = 158400
1 u = 158400 ÷ 66 = 2400
Difference between the higher monthly income and the lower monthly income
= 4 u - 1 u
= 3 u
= 3 x 2400
= $7200
Answer(s): $7200