Aski shop has a markup rate of 50% find the selling price of skis that cost the store owner $300. tell me how you got the answer

If nthe shop has a mark up rate of 50% and they cost 300 to buy you multiply 300 by 50%  convert 50% to decimal
so you do .5*300=150
then you add 150 to 300 which means that the shop sells the skis for 450 dollars.

He was paid 23 dollars for each lawn

The answer would be 13.5 minutes.