• # question_answer A number is increased by 10% and then it is decreased by 10%. What is the net increase or decrease? A)  1% increase                  B)  1% decreaseC)  2% increase                  D)  2% decrease

(b): Let no. be x 10% increase $\Rightarrow x$ becomes $1.1x$ Then 10% decrease $\Rightarrow 1.1x$ becomes $1.1x\frac{90}{100}=0.99x.$ $x\to 0.99x\Rightarrow 1%$decrease.