The Holt family is purchasing 4 cell phones. Store A sells 3 cell phones that cost $165 each, which includes a fourth phone for free. Store B sells the same cell phone for $135 each. Which store has the better deal for purchasing 4 cell phones? Explain.

Store A

Step-by-step explanation:

Given

Store A sells 3 cells phones that cost $165 each and offer 4 th one free

i.e. Effective cost of each cell phone is  

Store B sells each cell phone at each

clearly, store A provides a better deal than B because the cost of 4 cell phones is less for Store A i.e.

step-by-step explanation:

the triangles are similar. therefore the corresponding sides are in proportion:

              cross multiply

            divide both sides by 32