Question

You are making several purchases from the I.B. Electric electronics store. You can buy from this retailer online or in a physical store. You have a coupon for 15% off that can only be used in the physical store and a $5.00 off coupon that can only be used online. The sales tax of 6% only applies to the physical store. Shipping for the online store is a flat rate of $8.99. Using this information and the information below, which way would you save the most money?

Answer 1

Buy the batteries and stereo online: 

4.99*2= $9.98 +$90 = $99.98 
6.99-5.00 = $1.99 
99.98+1.99=$101.97 

3Cds in store 
7.97*3= $23.85 
5% tax = 1.19 
10% off = 2.39 
$23.85 - $1.19= $22.66 

22.66 + 101.97= $124.63 

All in store: 
12+100+23.85= 135.85 - 6.45 = $129.40 

All online: 
9.98 + 90 + 26.85= 126.85 +$1.99 = 128.84

Answer 2

Physical store: 15% discount ;6% sales tax.
Online store: $5 off ; shipping fee $8.99

Let us assume that the total item bought costs $100

Physical store:
100 x 15% = 15 discount
100 - 15 = 85 discounted cost of item
85 * 6% = 5.1 sales tax
85 + 5.1 = 90.10 total cost

Online store:
100 - 5 = 95 discounted cost of item
95 + 8.99 = 103.99 total cost

It's cheaper to go and visit the physical store.