The total monthly incomes of 21 men is $62400.
47 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 |
12 |
9 |
|
Value |
1 u |
4 u |
|
Total value |
12 u |
36 u |
48 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 + 36 u
= 48 u
48 u = 62400
1 u = 62400 ÷ 48 = 1300
Difference between the higher monthly income and the lower monthly income
= 4 u - 1 u
= 3 u
= 3 x 1300
= $3900
Answer(s): $3900