x = 17; please make X clearly in solution

2. A furniture manufacturing company working on a "10*X+20" hour per week basis makes 1000 chairs. The sales price is 70 each, and the company has the following costs: Direct labor - 3 per hour; Direct materials - 7000; Overhead - 1500. a. Calculate the multi-factor productivity of the company by considering the sales price. b. What will be the new multi-factor productivity if the company decides to make 1350 chairs per week? What will be the percentage change? c. If the company decides to improve productivity in (a) through materials costs reduction only, how much these costs must be reduced in order to achieve a 10 percent increase in multi-factor productivity