Investors buy a studio apartment for $240,000. Of this amount, they have a down payment of $60,000. a. Their down payment is what percent of the purchase price?
b. What percent of the purchase price would a $12,000 down payment be?

Data from 2005 for various age groups show that for each $100 increase in the median weekly income for whites, the median weekly income of blacks increases by $105. also, for workers of ages 25 to 54 the median weekly income for whites was $676 and for blacks was $527. (a) let w represent the median weekly income for whites and b the median weekly income for blacks, and write the equation of the line that gives b as a linear function of w. b = (b) when the median weekly income for whites is $760, what does the equation in (a) predict for the median weekly income for blacks?