Designer dolls, inc. found that the number n of dolls sold varies directly with their advertising budget a and inversely with the price p of each doll. the company sold 5200 dolls when $26,000 was spent on advertising and the price of a doll was set at $30. determine the number of dolls sold when the amount spent on advertising is increased to $52,000. round to the nearest whole number.
a. 5,200 dolls
b. 1,723 dolls
c. 3,447 dolls
d. 10,400 dolls