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eduard
3 years ago
8

The original selling price of a share of stock was d dollars. The selling price for a share of the same stock at a later date wa

s represented by the expression 1.15(0.95d). Which description could explain what happened to the price of the share of stock?
A The price decreased by 5% and then increased by 0.15%
B The price decreased by 95% and then increased by 0.15%
C The price decreased by 5% and then increased by 15%
D The price decreased by 95% and then increased by 15%
Mathematics
1 answer:
PtichkaEL [24]3 years ago
4 0
Original selling price = d
selling price at a later date = 1.15(0.95d)

0.95d means that the original price was discounted by 5%
1.15 means that the price increased by 15%

So the correct answer choice is: 

<span>C The price decreased by 5% and then increased by 15%
</span>
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Bob has two weekend jobs last weekend he made a total of $77 after working as a cashier for 5 hours and delivering newspapers fo
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Answer: $9 per hour at his job as a cashier and $8 per hour at his job delivering newspapers.

Step-by-step explanation:

1. Let's call the amount he got paid per hour at his job as a cashier: x.

Let's call the amount he got paid per hour at his job delivering newspapers: y.

2. Keeping on mind the information given in the problem above, you can make the following system of equations:

\left \{ {{5x+4y=77 \atop {6x+3y=78}} \right.

3. You can solve it by applying the Substitution method, as following:

- Solve for one of the variables from one of the equations and substitute it into the other equation to solve for the other variable and calculate its value.

- Substitute the value obtained into one of the original equations to solve for the other variable and calculate its value.

 4. Therefore, you have:

5x+4y=77\\5x=77-4y\\x=\frac{77-4y}{5}=15.4-0.8y

Then:

6(15.4-0.8y)+3y=78\\92.4-4.8y+3=78\\-1.8y=-14.4\\y=8

Finally:

5x+4(8)=77\\5x+32=77\\5x=45\\x=9

Therefore he got paid $9 per hour at his job as a cashier and $8 per hour at his job delivering newspapers.

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