I'll represent the cost of a pencil by the variable p.
12p=1.44
p=1.44/12
p=0.12
So 4 pencils would cost:
4p=0.12*4
4p=0.48
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A gross of pencils is 144 pencils.
A gross (a dozen dozen) is equal to 144. Therefore you would have 432 pencils.
Cost of each pencil is: 9.75/39. Or, .25 each. A gross is 144 items. So, a gross of pencils would cost 36. Of course, a gross is a unit of quantity where there is often a discount from the single unit price. So a gross of pencils may have a price less than 144 times the single unit price.
144*3=432
A box with 144 pencils in. A gross refers to a group of 144 items (a dozen dozen or a square dozen).