Paradise Solar Lights marked up each box of four-color-changing LED solar accent lights 8.25. The 60% markup of 8.25 was based on cost. Find the cost and selling price of each box of lights.
a) Cost: 5.15, Selling price: 8.25
b) Cost: 3.15, Selling price: 5.04
c) Cost: 5.15, Selling price: 8.25
d) Cost: 3.15, Selling price: 8.25