You would take 180•15% to get 27 then you would subtract 180-27 to get 153. After you do the first you would do 200•20% to get 40 200-40=160 so the cheaper one would be the 180 because about 15% discount it’s 153 and 160>153
10q equals 7p because of the difference
The answer
21
Explanation
First you find the original volume which is 10x7x3=210
Then you find the new volume which is 9x7x3=189
Finally take 210-189= 21