Which rate is the best deal for making copies at the copy store?

a.

$1.25 for 20 copies

b.

$3.15 for 50 copies

c.

$3.70 for 60 copies

d.

$4.50 for 75 copies

The first week samantha learned to read braille, she could read 10 words per minute. in the second week she increased her speed by 20%. in the third week she increased her speed again by another 25%. how many words could she read per minute by the third week? hurry and tell me!