An appliance store knows that if it sells its new gadgets for R50 each it can sell 200 per month, and if it
sells the same gadgets for R40, it will sell 300 per month. Let p represent the price of the gadgets and let
n represent the number of gadgets that is sold per month. Assume that the relationship between price and
sales is linear and that the sales are dependent on the price of the gadgets. The linear equation you could
use to predict sales for other prices, is
 10p + n = 700.
 10p + n = 600.
 10p ? n = 700.
 10p ? n = 200.
 none of the above.