Matthew bought a suitcase marked down from $90 to $81. What is the discount percentage?

10%

Step-by-step explanation:

Percent change= New-Old |Old|× 100% percent change=81-90 |90| × 100= -9 90×100=-10%

entering that problem on the tube might get you an answer

the mistake in the pattern is that :

b. the decimal point was moved one too many place values each time

the correct pattern could be made by :

b. moving the decimal point to the right the same numbers of place values as the exponents