



 
Hi Anish, Percent means "per onehundred" so 2.5 percent is $\large\frac{2.5}{100}$ and 1 billion is 1,000,000,000 so 1.5 billion is $1.5 \times 1,000,000,000.$Hence 2.5 percent of 1.5 billion is \[\frac{2.5}{100} \times 1.5 \times 1,000,000,000.\] Rewriting this I get \[2.5 \times 1.5 \times 10,000,000 = 3.75 \times 10,000,000= 37.5 \times 1,000,000.\] Since 1 million is 1,000,000 we have 2.5 percent of 1.5 billion is 37.5 million. Penny 



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