Isaiah will get the lowest price on 4 tires at store R.
Step-by-step explanation:
Step 1:
At store R, we get the fourth tire for free, if we buy three tires.
Each tire costs $150, so the cost of 3 tires is [tex]3(150) = \$ 450[/tex].
So at store R, we get 4 tires for $450.
At store S, if we buy 4 tires, we pay $70 off for each tire.
Each tire costs $200, so the cost of 4 tires is [tex]4(200) = \$800.[/tex]
If we get $70 off for each tire, we get [tex]4(70) = \$ 280[/tex] for 4 tires.
So at store S, we get 4 tires for [tex]800-280 = \$ 520.[/tex]
So at store S, we get 4 tires for $520.
Step 2:
At store T, if we buy 4 tires, we pay $200 off the total price.
Each tire costs $175, so the cost of 4 tires is [tex]4(175) = \$700.[/tex]
If we get $200 off the total price, we get [tex]700-200 = \$ 500[/tex] for 4 tires.
So at store T, we get 4 tires for $500.
At store V, if we buy 4 tires, we get 10% of the total price.
Each tire costs $130, so the cost of 4 tires is [tex]4(130) = \$520.[/tex]
If we get 10% off the total price, we get [tex]520 - 52 = $468[/tex] for 4 tires.
So at store V, we get 4 tires for $468.
Step 3:
So we get 4 tires at store R for $450, we get 4 tires at store S for $520. We get 4 tires at store T for $500 and we get 4 tires at store V for $468.
So Isaiah will get the lowest price on 4 tires at store R.
