All categories

2 years ago

a man earned and interest of 240 in 4 years at 20%per annum simple interest. calculate the principal

Mathematics

2 answers:

MAVERICK [17]2 years ago

8 0

We need I = prt.

240 = p(0.20)(4)

240/[(0.20)(4)] = p

Use your calculator to calculate the left side.

bazaltina [42]2 years ago

7 0

Answer:

Step-by-step explanation:

P x 20/100 x 4=240

1/5 x 4p =240

4/5p x5=240 x 5

4p/4=1200/4

p=300

You might be interested in

What sequence is modeled by the graph below?

Lady bird [3.3K]

ANSWER

$a_n= \frac{1}{2}( {2}^{n - 1} )$

EXPLANATION

The corresponding ordered pairs from the graph are:

(2,1) (3,2) (4,4) (5,8)

The y-values are:

1,2,4,8

The first term term is the term before 1,this has to be.

$a_1= \frac{1}{2}$

The common ratio is

$r = \frac{2}{1} = 2$

The nth term is given by

$a_n=a_1 {(r}^{n - 1} )$

Let's substitute the values to get,

$a_n= \frac{1}{2} \times {(2}^{n - 1} )$

This simplifies to,

$a_n= \frac{1}{2} {(2}^{n - 1} )$

3 0

3 years ago

How large a sample should be selected to provide a 95% confidence interval with a margin of error of 6? Assume that the populati

marshall27 [118]

Using the z-distribution, it is found that a sample of 171 should be selected.

<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

$\overline{x} \pm z\frac{\sigma}{\sqrt{n}}$

The margin of error is:

$M = z\frac{\sigma}{\sqrt{n}}$

In which:

$\overline{x}$ is the sample mean.

z is the critical value.

n is the sample size.

$\sigma$ is the standard deviation for the population.

For this problem, the parameters are:

$z = 1.96, \sigma = 40, M = 6$

Hence we solve for n to find the needed sample size.

$M = z\frac{\sigma}{\sqrt{n}}$

$6 = 1.96\frac{40}{\sqrt{n}}$

$6\sqrt{n} = 40 \times 1.96$

$\sqrt{n} = \frac{40 \times 1.96}{6}$

$(\sqrt{n})^2 = \left(\frac{40 \times 1.96}{6}\right)^2$

n = 170.7.

Rounding up, a sample of 171 should be selected.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

4 0

1 year ago

Please someone help me with this

shtirl [24]

Answer:

2,-1.5

Step-by-step explanation:

To find the midpoint of a line segment, take the average of the x coordinates and y coordinates of the two points that make it up.

$\frac{2+2}{2} ,\frac{4+(-7)}{2}$

= $\frac{4}{2} , \frac{-3}{2}$ $\frac{4}{2} , \frac{-3}{2}$

=2,-1.5

7 0

2 years ago

Read 2 more answers

a student earned a grade of 80% on a math test that had 25 problems. how many problems on this test did the student answer corre

Mamont248 [21]

80% of 25
percent means parts out of 100
'of' means multiply
80% of 25 means
80/100 times 25=40/50 times 25=20/25 times 25=20

answer is 20 problems

6 0

2 years ago

Read 2 more answers

How do you access the math tutor on Brainly for free? Sometimes it says it costs money and then a couple weeks later it's free a

Vilka [71]

Just answer some questions

3 0

2 years ago

a man earned and interest of 240 in 4 years at 20%per annum simple interest. calculate the principal​

a man earned and interest of 240 in 4 years at 20%per annum simple interest. calculate the principal