Question

Need a little help pleaseee :,>?

Porter is visiting India and would like to purchase some local spices. He finds some spices that cost 401.39 rupees. If the current exchange rate is 1 dollar:73.6500 rupees, how much do the spices cost in U.S. dollars?

$29,562.37
$18.35
$5.45
$0.05

Answer 1

well, we know the exchange rate is 1 buck for 73.6500 rupees, well, how many dollars in 401.39 rupees?

`\begin{array}{ccll} dollars&rupees\\ \cline{1-2} 1 & 73.6500\\ x& 401.39 \end{array} \implies \cfrac{1}{x}~~=~~\cfrac{73.6500}{401.39} \\\\\\ 401.39=73.65x\implies \cfrac{401.39}{73.65}=x\implies 5.45\approx x`