1) shane works at a computer store. if he earns $20.93 from a 7% commission on the sale of a printer, what is the price of the printer?
2) kayla earns a weekly salary of $290 plus a 5.5% commission on sales at a gift shop. how
much would she make in a week if she sold $5700 worth of merchandise?
3) heather works in a clothes shop, where she earns a commission of 5% and no weekly salary. what will heather's weekly sales have to be for her to earn $375 in one week?
4) the sales tax rate in brad's town is 4.25%. if he buys 3 lamps for $22.49 each and a sofa for $829.99, how much sales tax does he owe?

1. he earns 20.93 which is 7% of the price of the printer so 7%=7/100 so
20.93=7/100 so here is a little trick
     so we want to know what 100% is so
      we know that 1/2 is equal to 4/8 so since they are equal, we can flip one of them and if we multiply them with each other, we will get 1/1 or 1 so 1/2 times 8/4=8/8 or 1 so

20.93/x (x=100%)
20.93/x=7/100 so
20.93/x times 100/7=1
2093/7x=1
multiply both sides by 7x
2093=7x
divide both sides by 7
299=x
the printer cost $299

2.so 290+5.5% of sales
sales=5700
5.5%=0.055
'of' can be thought of as multiply so
0.055 times 5700=313.5
290+313.5=603.5=what she made that week

3. she earns 5% and that's all she earns
5%=375
a hack is that 5 times 200=100 so
5% times 20=100% so
375 times 20=100%=$7500=amount that needs to be sell to get 375

4. so he buys 3 laps at 22.49 each and 829.99 with 4.25% or
3 times 22.49=67.47+829.99 times 4.25% or
897.46 times 4.25% or 897.46 times .0425 and get $38.1421 sales tax owed