The total monthly incomes of 21 men is $39000.
47 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 |
9 |
|
Value |
1 u |
3 u |
|
Total value |
12 u |
27 u |
39 u |
Number of men with lower incomes
=
47 x 21
= 12
Number of men with higher incomes
= 21 - 12
= 9
Total monthly incomes
= 12 u + 27 u
= 39 u
39 u = 39000
1 u = 39000 ÷ 39 = 1000
Difference between the higher monthly income and the lower monthly income
= 3 u - 1 u
= 2 u
= 2 x 1000
= $2000
Answer(s): $2000