Notebooks cost $1.50 each. This weekend they will be on sale for $0.80. What percentage is the sale?

33%

Step-by-step explanation:

To start take the original price and divide it by the new sale price.  $1.20/$0.80 = 0.66666.  We can then round that answer to 0.67.  if the new price is 67% of the original price we must then we know that 67% minus the 100% will give us the discount.  100% - 67% = 33%

Answer = 33%

step-by-step explanation:

to find if any function is an inverse of the other, put the first equation in as x in the next one. then simplify and solve. if at the end you get the statement y = x, then it is an inverse. if you get anything else, it is not.