How can you find the interest rate on a loan?

a$.$ By using the formula r $=($P $/$ PV$)*(1-(1+$r$))$

b$.$By using the formula r $=($P $/$ PV$)*(1-(1+$r$))$

c$.$To find the interest rate on a loan, you can use the formula r $=(($P $/$ PV$)-1)*(1-(1+$r$)),$ where r is the interest rate, P is the loan payment, PV is the present value of the loan, and $$ is the number of payment periods. You can use trial and error or mathematical methods, such as the Newton$-$Raphson method, to solve for the interest rate.

d$.$By asking the lender