SOLUTION: Jai is shopping for jeans and finds a style she likes so much that she may buy more than one pair. The jeans cost $50 each and are on sale for 30% off. Write an expression for the

Algebra ->  Expressions-with-variables -> SOLUTION: Jai is shopping for jeans and finds a style she likes so much that she may buy more than one pair. The jeans cost $50 each and are on sale for 30% off. Write an expression for the       Log On


   

Question 940319: Jai is shopping for jeans and finds a style she likes so much that she may buy more than one pair. The jeans cost $50 each and are on sale for 30% off. Write an expression for the sale price of the jeans in such a way that the original price is evident. Then,write a function rule for the expression and simplify it. Use this function to find out how much money it will cost if Jai buys 4 pairs.
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Let +s+ = sales price
Let +p+ = original price
Let +n+ = number of jeans he buys
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+s+=+n%2A%28+p+-+.3p+%29+
+s%28n%2Cp%29+=+n%2A%28+.7p+%29+
+s%28n%2Cp%29+=+.7n%2Ap+
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+n+=+4+
+p+=+50+
+s%284%2C50%29+=+.7%2A4%2A50+
+s%284%2C50%29+=+140+
It cost him $140