PLZ HELP ASAP EXTRA POINTS!!!

On August 1, 1958, first-class postage for a 1-ounce envelope was 4 cents. On August 1, 2007, a first-class stamp for the same e

Andrej [43]

Answer:

4.86%

Explanation:

Given that,

First-class postage for a 1-ounce envelope = 4 cents

On August 1, 2007

A first-class stamp for the same envelope cost = 41 cents

Period, n = 49 years

$F=P(1+i)^{n}$

$41=P(1+i)^{49}$

$\frac{41}{4}=(1+i)^{49}$

$10.25\ cents=(1+i)^{49}$

$1.0486=(1+i)$

i = 1.0486 - 1

= 0.0486 or 4.86%

Therefore, the interest rate is 4.86%.

3 0

2 years ago

A real estate agent is considering changing her cell phone plan. There are three plans to choose from, all of which involve a mo

Anni [7]

Answer:

req 1)

Plan A

0.42 x 150 + 0.17 x 70 = 74.9

Plan B

0.52 x 150 + 0.15 x 70 = 88.5

Plan C $80

req 2)

from 0 to 190 minutes Plan A

from 191 and beyond Plan C

req 3)

the proportion should be 1/6 daycalls and 5/6 evenings

Explanation:

150 day calls

70 minutes evening calls

Plan A

0.42 x 150 + 0.17 x 70 = 74.9

Plan B

0.52 x 150 + 0.15 x 70 = 88.5

Plan C $80

2) A will be preferable to B as it has the lower cost

now at some point C will be better as the cost is a flat rate

80 dollars / 0.42 per minute = 190.47

3) 0.42X + 0.17Y = 0.52X + 0.15Y

a minute of daycall is 10 cent higher in plan B

while a minute of evening call is 2 cent lower

thus, to balance there was to be 5 times more evening call than day times:

1:5 1 + 5 = 6

the proportion should be 1/6 daycalls and 5/6 evenings

8 0

3 years ago

A home electrical system is joined to the electric company's system at the junction of the

Alenkinab [10]

This is a breeze it is wires

5 0

3 years ago

A rich uncle wants to make you a millionaire. How much money must he deposit in a trust fund paying 12% compounded quarterly at

Reptile [31]

Answer:

P=24.92 per quarter

Explanation:

this problem can be solved applying the concept of annuity, keep in mind that an annuity is a formula which allows you to calculate the future value of future payments affected by an interest rate.by definition the future value of an annuity is given by:

$s_{n} =P*\frac{(1+i)^{n}-1 }{i}$

where $s_{n}$ is the future value of the annuity, $i$ is the interest rate for every period payment, n is the number of payments, and P is the regular amount paid. so applying to this particular problem, we have: