A bike in a store costs $230. It's on sale for 25% off. Find the sale price.

57.50 dollars

Step-by-step explanation:

you can use a calculator and multiply so it would give you the finishes product

172.5

Step-by-step explanation:

you do 230/4 which is 57.5 then you got to do 57.5 times 3 which is 172.5

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4