Question

Pens are bought at .95 a dozen and sold in groups of four for $2.25. Find the profit on 15 dozen pens.

Answer 1

D=.95
4D=2.25
there are 3 4Ds in 15D after that 3 dozen are left over
3(4D)+3(D)=3(2.25)+3(.95)

Answer 2

Where did the 3 come from?

Answer 3

3 x 4= 12 +3= 15

Answer 4

right

Answer 5

now what is 3(2.25)+3(.95)

Answer 6

6.75 + 2.85= 9.6

Answer 7

yes

Answer 8

So $9.60 is the profit.

Answer 9

thanks.