Answer:
56 %
Step-by-step explanation:
Total no of customers = 500
Used coupon = 220
Not used coupon = 500 - 220 = 280
We need to find the percentage of the customers do not use a coupon. It can be given by :
[tex]\%=\dfrac{280}{500}\times 100\\\\=56\%[/tex]
So, there are 56% of the customers that do not use a coupon.