Question

which coupon should fernando use to save the most money on a trampoline originally priced at $95?

Explanation:

Step1: Calculate the discount with the green coupon

The green coupon gives a flat - $15$ discount. Since the price of the trampoline is $95$ and $95>90$ (the threshold for the green coupon), the discount amount is $15$.

Step2: Calculate the discount with the purple coupon

The purple coupon gives a $20\%$ discount. The formula for calculating the discount amount is $D = p\times r$, where $p$ is the original price and $r$ is the discount rate. Here, $p = 95$ and $r=0.2$. So, $D=95\times0.2 = 19$.

Answer:

Fernando should use the purple coupon (the $20\%$ off coupon) because it gives a discount of $19$, while the green coupon gives a discount of $15$.