Lim 1+2+3+...+n÷1+4+9+...+(2n-1)in the
n-infinite second power

Based on what i know about mean, this doesn't add up.

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?

Which will form a composite function?