LET the purchasing VALUE of the product 3 years ago = P.Depreciation rate = 20% EVERY year.Time = 3 years.EQUIVALENT depreciation rate for 3 years :Equivalent rate for 2 years = (20 + 20) - {(20 × 20) ÷ 100}= 40 - (400 ÷ 100)= 40 - 4 = 36%.Equivalent rate of 36% and 20% = (36 + 20) - {(36 × 20) ÷ 100}= 56 - (720 ÷ 100)= 56 - 7.2 = 48.8%.Thus, the product value has been depriciated by 48.8% in 3 years.Remaining value = 100 - 48.8 = 51.2%.Given that-Present value = Rs. 10,000.51.2% of P = 10,000.(51.2 ÷ 100) × P = 10,0000.512 × P = 10,000P = 10,000 ÷ 0.512P = 19531.25 ~ 19531Thus, the value of the product 3 years ago was Rs. 19531.Hence, the correct answer is "19531".