During a sale at a bookstore, Joseph buys a book at full price. He is given a 50 percent discount on a second book of equal or l
ess value. If Joseph buys two books with full price values of $15 and $10 respectively, what is the total percent cost reduction during the sale of the two books ?
<span>For chess club:
y1 = 16 + 1*x where y1 = total number of members after x months
.
For film club:
y2 = 4 + 4*x where y2 = total number of members after x months.
y1 = y2 when:
16 + x = 4 + 4x
3x = 12
x = 4 months Answer: C. 4 months.</span>
