The price in store A is:
[tex](132.89\cdot(1-0.2))\cdot(1-0.2)=(132.89\cdot0.8)\cdot0.8=106.344\cdot0.8=85.0752.[/tex]
The price in store B is:
[tex]132.89\cdot(1-0.4)=132.89\cdot0.6=79.734.[/tex]
Finally, the price in store C is:
[tex](132.89\cdot(1-0.3))\cdot(1-0.15)=(132.89\cdot0.7)\cdot0.85=93.023\cdot0.85=79.06955.[/tex]
Answer: At store C you can get the skateboard for the lowest price.
