The total monthly incomes of 30 men is $178200.
25 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 |
12 |
18 |
|
Value |
1 u |
3 u |
|
Total value |
12 u |
54 u |
66 u |
Number of men with lower incomes
=
25 x 30
= 12
Number of men with higher incomes
= 30 - 12
= 18
Total monthly incomes
= 12 u + 54 u
= 66 u
66 u = 178200
1 u = 178200 ÷ 66 = 2700
Difference between the higher monthly income and the lower monthly income
= 3 u - 1 u
= 2 u
= 2 x 2700
= $5400
Answer(s): $5400