To solve for the interest rate of your credit card, you need to understand which variables in the above formula you have. If your minimum monthly payment is $22 on the $1,000. credit card bill, which variables do you know the value of?

ince the bases are different on the left and right sides, you would have to take the natural log of both sides and move the exponent down using log laws (i.e. xlog23 = log6). Then, you can isolate for 'x' by dividing both sides by log23. If the bases were the same, you would have to expand one of the bases into an equivalent expression that matches the base on the other side (i.e. 4^x = 2 would turn into (2^2)^x = 2) and then solve for x by equating the bases.

I hope this helps!