Sam opened a money-market account that pays 5% simple interest. He started the account with $7,000 and made no further deposits.
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the cost of each notebook and thumb drive is $5 and $12 respectively .
<u>Step-by-step explanation:</u>
Here we have , Sam Ana Maria were shopping for school supplies. Each purchased different quantities of the same notebook and thumb drive. Sam bought 4 notebooks and 1 thumb drive for $32. Maria bought 3 notebooks and 2 thumb drives for $39. We need to find the cost of each notebook and thumb drive. Let's find out:
Let the cost of each notebook and thumb drive be x & y respectively , So
Sam bought 4 notebooks and 1 thumb drive for $32.
With info following is equation below:
⇒ ....... (1)
Maria bought 3 notebooks and 2 thumb drives for $39
With info following is equation below:
⇒ ............ (2)
Multiplying equation (1) by 2 and Than subtracting (1) by (2):
⇒
⇒
⇒
⇒
Putting in
we get:
⇒
⇒
⇒
Therefore , the cost of each notebook and thumb drive is $5 and $12 respectively .