(X^3-1) divides by (x+2)

Monthly income from my primary job: $2034.24

Fixed expenses per month: 30% of monthly income from primary job = 30% x $2034.24 = $610.27

Remaining income: $1423.97

Hourly income from secondary job: $9.5

Deductions are:

FICA - 7.65% of hourly income = 7.65% x $9.5 = $0.72675

Federal tax withholding = 11.5% x $9.5 = $0.10925

State tax withholding = 7.75% x $9.5 = $0.73625

Thus, the remaining income in hand would be $7.8445/hr

The amount he can earn in next 5 months: ($2034.24 x 5) + ($9.5 x 30 x 5) = $10171.2 + $1425 = 11592.2

=> $11592.2 is the amount he needs to save in next 10 months.

20% of primary income needs to be saved: 20% x $1423.97 = $284.794

In 10 months: $284.794 x 10 = $2847.94 (this is amount he will save from primary income)

Reamining amount to save: $11592.2 - $2847.94 = $8748.26 (this is the amount he'll save from secondary job)

$9.5 x 920 = $8740 (approx $8748.26)

Thus, it will have to work 920 hours to save that much.