If bank wished to earn $6,300 on a loan over twelve months, what interest rate would the bank have to charge?

That depends upon the size of the loan.

Oops, I left out the loan amount. It's a $50,000 loan.

I = PRT

6300 = 50,000 * R
6300/50,000 = R
0.126 = 12.6% = R

To calculate the interest rate required for a loan, we can use the formula for simple interest:

Interest = Principal × Rate × Time

In this case, we have the following information:
Interest = $6,300
Time = 12 months

Let's assume the Principal amount is P (the amount of the loan). We need to find the interest rate (Rate).

Using the formula, we can manipulate it to solve for the rate:

Rate = Interest / (Principal × Time)

Since the Principal amount is not given, we cannot calculate the exact interest rate without that information. Could you please provide the Principal amount of the loan?