If I can save a company $9,000 dollars a year by taking a loan out for $33,000 at a 5% interest rate how long would it take to return the investment?

This is the formula I am looking at.

Year 1                                                                               

P= $9,000(1+0.5)-1(year)

P= $9,000(1.5)-1(year)

P= $6,000

Total: $6000.00

Year 2

P= $9,000(1+0.5)-2(year)

P= $9,000(1.5)-2(year)

P= $4,000

Total:$10,000.00

Year 3

P= $9,000(1+0.5)-3(year)

P= $9,000(1.5)-3(year)

P= $2,666.67

Total: $12666.67

Year 4

P= $9,000(1+0.5)-4(year)

P= $9,000(1.5)-4(year)

P= $1,777.78

Total: $14444.45

Year 5

P= $9,000(1+0.5)-5(year)  

P= $1,185.18

Total: $15629.63