Find the common ratio of r 6,24,96,384

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

Given: △acm, m∠c=90°, cp ⊥ am , ac: cm=3: 4, mp-ap=1. find am.

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount