MCV 4U UNIT 4/5 TEST Sinusoidal, Exponential and Logarithmic Functions 5. J imbo runs a lemonade stand Where he sells 150 cups of lemonade a day, charging $8.00 a cup. His research analyst tells him that for every $0.50 increase in price, he will sell 10 less cups of lemonade a day. a) what is the demand, or price mction in terms of number of cups sold? [3] b) What is the marginal revenue when sales are at 100 cups of lemonade/day [3]