7. Continuing to assume that PG = $2 suppose that the quantity demanded of Robi's products decreases from Q = 10 to Q = 8. By how much did Robi's price increase and did Robi's revenue increase or decrease? A. price increases by $1 and revenue decreases B. price increases by $2 and revenue decreases C. price increases by $1 and revenue increases D. price increases by $2 and revenue increases E. none of the other choices is correct or it cannot be determined how revenue will change