A farm grew 19.8 tons of wheat in 2013. The farm's wheat output increased by 9.8% from 2013 to 2014 and by 5.1% from 2014 to 2015. Which expression represents a strategy for estimating the total output of wheat, in tons, in 2015?

A) 20+10+5

B) 20 (10) (5)

C) 20+1.1+1.05

D) 20 (1.1) (1.05)

Answer: D

Step-by-step explanation: Round the number 19.8 to 20, 9.8% to 10% and reduce 5.1% to 5%.

(1) In 2014, 20 tons increased by 10%, multiply 20 by 1.10 - (10% increase).

(2) In 2015, the quantity would need increase 20 (1.10) by 5%, multiply that quantity by 1.05.

Then, your answer will be D: 20 (1.1) (1.05)