1) 2.002 + 7.9 {2.8 - 6.3 (3.6 - 1.5) + 15.6} = ? A) 2.002 B) 4.2845 C) 40.843 D) 42.845 Answer: Option DExplanation:Given expression,2.002+7.9{2.8-6.3x2.1+15.6}= 2.002+7.9{2.8-13.23+15.6}=2.002+7.9{5.17}=2.002+40.843=42.845