Sandra is selling boxes of cookies and boxes of candy to raise money for charity.
each box of cookies costs $4, and each box of candy costs $6. if she sells all of her boxes of cookies and candy, she can make a
maximum of $400. sandra's goal is to sell at most 40 more boxes of candy than boxes of cookies.
choose the ordered pair that lies within the solution set.
a. (70,10)
b. (30,40)
c. (60,90)
d. (90,20)