Final answer:
Janet will have gained approximately $6,503.40 in interest on her cost.
Step-by-step explanation:
To find the amount of interest Janet will have gained onto her cost, we can use the formula for compound interest:
A = P(1 + r/n)^(nt)
Where:
- A is the amount after time t, including interest
- P is the principal amount (the initial cost)
- r is the annual interest rate (22% or 0.22)
- n is the number of times that interest is compounded per year (in this case, monthly, so n = 12)
- t is the time in years (8 months or t = 8/12 = 2/3)
Plugging in the values, we get:
A = 5550(1 + 0.22/12)^(12 * (2/3))
A = 5550(1.0183)^(8)
A ≈ 5550(1.1720)
A ≈ 6503.40
Therefore, the interest Janet will have gained onto her cost is approximately $6,503.40.