Computation problems!

1)12-10=2 The markup is 2

2 1

10 5

2) 28-21=7

7 1

28 4

The percent decrease is 25%

3)

_

=

_

_

= 0.2 = 20%

The percent increase is 20%

__

=

_

= 0.25 = 25%

The markdown is 7

24-15=9 The markup is 5

9 3

15 5

__

=

_

_

= 0.6 = 60%

The percent increase is 60%