Natalie likes to mail lots of postcards when she goes on vacation. in 2014 , the cost of a postcard stamp was $0.34.

part a: natalie buys 10 postcard stamps. what is the total cost of the stamps?

part b: natalie and her friends decide to buy 100 postcard stamps. what will be the total cost of the stamps?

Part A: The total cost of 10 stamps  =  $3.4

Part B: The total cost of 100 stamps  =  $34

Step-by-step explanation:

The cost of each postcard stamp = $0.34

Part A:

Number of postcard Natalie buys  =  10

So, the cost of 10 postcard stamps  =  10 x Cost of each stamp

                                                              = 10  x ($0.34)  = $3.4

or, the total cost of 10 stamps  =  $3.4

Part B:

Number of postcard Natalie buys  =  100

So, the cost of 100 postcard stamps  =  100 x Cost of each stamp

                                                              = 100  x ($0.34)  = $34

or, the total cost of 100 stamps  =  $34