Answer: 1st purchase=72.95 and 2nd puchase=63.45
To solve this, you need to define the two purchases algebraically. The purchase for which no information is given, we will define as x; therefore, the first purchase is equal to x. The second purchase is 9.50 less than the 1st purchase. Therefore, we define the second purchase as x-9.50. Now we know that the total of the two purchases is equal to 136.40 and therefore we get the following equation:
x=72.95; therefore this is the amount of the 1st purchase. By subtracting 9.50 from this amount we get the amount of the second purchase which equals 63.45.
Hope this helps.