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lidiya [134]
3 years ago
10

John's cell phone gives him 1250 minutes for $25. He used 1300 minutes. How much will his cell phone company bill him for?

Mathematics
2 answers:
Monica [59]3 years ago
4 0
Its would be 26$ because 1250 divided by 25$ is 50 and 1300 divided by 50 is 26$
kondaur [170]3 years ago
3 0

Answer:

$26.

Step-by-step explanation:

We have been given that John's cell phone gives him 1250 minutes for $25. We are asked to find John's bill for 1300 minutes.

First of all, we will find charges per minute by dividing $25 by 1250 as:

\text{Charge per minute}=\frac{\$25}{1250}

\text{Charge per minute}=\$0.02

Now, we will multiply 1300 by $0.02 to find John's bill.

\text{John's bill}=\$0.02\times 1300

\text{John's bill}=\$26

Therefore, John's company will charge him $26 for 1300 minutes.

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8 0
4 years ago
$13,168is invested, part at 13%and the rest at
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Answer: the amount invested at 13% is $9748

the amount invested at 5% is $3420

Step-by-step explanation:

Let x represent the amount invested at 13%.

Let y represent the amount invested at 5%.

$13,168 is invested, part at 13 % and the rest at 5%. This means that

x + y = 13168

The formula for determining simple interest is expressed as

I = PRT/100

Where

I represents interest paid on the loan.

P represents the principal or amount taken as loan

R represents interest rate

T represents the duration of the loan in years.

Considering the amount invested at 13%,

P = x

R = 13%

T =1 year

I = (x × 13 × 1)/100 = 0.13x

Considering the amount invested at 5%,

P = y

R = 5%

T = 1 year

I = (x × 5 × 1)/100 = 0.05y

If the interest earned from the amount invested at

13% exceeds the interest earned from the amount invested at

5% by $1438.24, it means that

0.13x - 0.05y = 1438.24 - - -- - - - - -1

Substituting x = 13168 - y into equation 1, it becomes

0.13(13168 - y) - 0.05y = 1438.24

1711.84 - 0.13y - 0.05y = 1438.24

- 0.13y - 0.05y = 1438.24 - 1711.84

- 0.08y = - 273.6

y = - 273.6/- 0.08

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x = 13168 - y = 13168 - 3420

x = 9748

7 0
3 years ago
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This study design in the above scenario is observational study because the researcher are obviously observing whether the vaccine is affecting the children. Note that Observational study is like experiment which attempts to understand the cause and effect relationships on a subject.

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Step-by-step explanation:

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