Shawn has a balance of $1200 on a credit card with an APR of 18.7%, compounded monthly. About how much will he save in interest over the course of a year if he transfers his balance to a credit card with an APR of 12.5%, compounded monthly? (Assume that Shawn will make no payments or new purchases during the year, and ignore any possible late payment fees.)
A. $87.33 B. $181.46 C. $85.77 D. $117.85