The total monthly incomes of 12 men is $23400.
34 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 |
9 |
3 |
|
| Value |
1 u |
3 u |
|
| Total value |
9 u |
9 u |
18 u |
Number of men with lower incomes
=
34 x 12
= 9
Number of men with higher incomes
= 12 - 9
= 3
Total monthly incomes
= 9 u + 9 u
= 18 u
18 u = 23400
1 u = 23400 ÷ 18 = 1300
Difference between the higher monthly income and the lower monthly income
= 3 u - 1 u
= 2 u
= 2 x 1300
= $2600
Answer(s): $2600
