Evaluating expressions with variables word problems

label Algebra
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schedule 1 Day
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The expression 

62.4d-21062.4d−210 gives the number of Indian rupees you receive when you exchange \$d$d at the local currency exchange.
How many Indian rupees do you receive when you exchange \$13$13?
May 29th, 2015

im not sure where the expression is but given the number of Indian rupees you receive when you exchange at the local currency exchange.

say we have $1 cad and get 2 Indian rupees then we would have xy=s   meaning that if we have x cad and the conversion rate is 2x or if its 1.2 Indian rupees then it is 1.2 for y and s is the amount you receive when you exchange. 

same if the exchange rate is $1 cad for $1.20 USD then it is 1.2x=s so if you give 1 CAD you get $1.2 USD

May 29th, 2015

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May 29th, 2015
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May 29th, 2015
Jun 25th, 2017
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