We sell two products.

Product A:

---------------------------

price y1 = 10

quantity y1 = 2

sales y1 = 20 (price*quantity)

price y2 = 10

quantity y2 = 1

sales y2 = 10 (price*quantity)

Product B:

---------------------------

(p) price y1 = 5

(q) quantity y1 = 2

(s) sales y1 = 10

(p) price y2 = 1

(q) quantity y2 = 2

(s) sales y2 = 2

Analysis:

---------------------------

I want to know by how much our prices and quantities have increased for all products in total (or maybe rather on average) from year 1 to year 2.

Let's use capital letters for the total profit, quantity and sales per year: S, P, Q.

I know that S = P * Q.

I want to measure the price and quantity change. So let's set the capital letters to ratios of year 1 values: S1=1, P1=1 and Q1=1. I know that S2 = 12/30.

What are P2 and Q2?