Question

cost of one ball pen is $20.50 find the cost of one book answer​

Answer 1

Step-by-step explanation:

Given,

Cost of each ball pen =Rs.x

Cost of each fountain pen =Rs.y

So,

Cost of y² ball pens =y²×x.

Cost of x²fountain pens=x²×y

Thus,

Cost of y²ball pens and x² fountain pens

=y²×x×x²×y

=xy²+x²y. is the answer...

Hope its help...