The total monthly incomes of 20 men is $82800.
35 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 |
8 |
|
Value |
1 u |
3 u |
|
Total value |
12 u |
24 u |
36 u |
Number of men with lower incomes
=
35 x 20
= 12
Number of men with higher incomes
= 20 - 12
= 8
Total monthly incomes
= 12 u + 24 u
= 36 u
36 u = 82800
1 u = 82800 ÷ 36 = 2300
Difference between the higher monthly income and the lower monthly income
= 3 u - 1 u
= 2 u
= 2 x 2300
= $4600
Answer(s): $4600