I know I asked this question but i didnt get a answer.I really need help, thank you so so much

Question

credit card (Credit Card A) charges 18% compounded monthly. The second credit card (Credit Card B) charges 18% compounded semi-annually. The third credit card (Credit Card C) charges 17% compounded quarterly.

Which credit card do you assume will be the best deal?
Tyler isn’t sure which credit card is the best deal, so he wants to do some comparison. You’re going to help him out using the skills you learned in the Exponents Unit to create some equations and graphs to determine the best deal.Let’s suppose he is going to buy a smartphone for $607.99 and put the entire balance on the credit card. (2pts each)

Credit card A
B=607.99(1.15) ^12t

Credit card B
B=607.99 (1.09) ^2t

Credit card C
B=607.99 (1.0425) ^4t

Balance After ( T= time year)
Credit Card Equation 0 year 3 month 6 months 1year 2years
A $607.99(1.15)^12t $607.99 $664.80
B $607.99 (1.09) ^2t
C $607.99 (1.0425) ^4t

Answer 1

18% annually is 1.5% monthly = 1.015, not 1.15