Question

Can someone explain this to me

Answer 1

Price: 10.00$
The percentage that is off:54percent
Tax:2percent.

You need to add the tax(2%) to the markup(54%) and subtract that from the original cost

Answer 2

Radio was 10
got markup of 54%
this implies it is almost 1/2x more than 10
10*1 is 100% of 10
use this fact and take 10 + .54*10=New Cost (nc)
tax is 2% use nc*1.2