Identify the initial amount a and the rate of decay r (as a percent) of the exponential function y = 8(1 -0.15)'. Evaluate the function when t=3. Round your answer to the nearest tenth.

Acomputer store buys a computer system at a cost of $370.80. the selling price was first at $ 618, but then the store advertised a 20 % markdown on the system. answer parts a and b. a. find the current sale price.