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3 years ago

How many years will it take for 20$ to grow to 100 if the simple interest rate is 4% annually

Mathematics

1 answer:

cestrela7 [59]3 years ago

3 0

The formula for simple interest is:

Total = Principal(1+ Rate x time)

You are given:

Total = $100

Principal = $20

Rate = 4%

You are asked to find the time.

Replace everything known in the formula:

100 = 20(1 +0.04 x Time)

Now solve for Time:

Divide each side by 20:

5 = 1 + 0.04 x Time

Subtract 1 from each side:

4 = 0.04 x time

Divide each side by 0.04:

Time = 4 / 0.04

Time = 100 years.

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Six machines, each working at the same constant rate, together can complete a certain job in 12 days. How many additional machin

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Answer:

3 machine

Step-by-step explanation:

It is given that 6 machine each working at the same rate can complete the work in 12 days

We the has to complete in 8 days

Let we need x extra machine to complete the work in 8 days

So total number of machines =x+6

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$6\times 12=(x+6)\times 8$

$8x+48=72$

$8x=24$

x=3 machine

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4 years ago

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Step-by-step explanation:

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3 years ago

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Look at the attached picture.

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A turtle is 20 5/6 inches below the surface of a pond. It dives to a depth of 32 1/4 inches. What was the change in the turtles

Lana71 [14]

Alrite, so their change is just their difference, namely 32 1/4 - 20 5/6.

let's change those to "improper" fractions first.

$\bf 20\frac{5}{6}\implies \cfrac{20\cdot 6+5}{6}\implies \cfrac{125}{6}
\\\\\\
32\frac{1}{4}\implies \cfrac{32\cdot 4+1}{4}\implies \cfrac{129}{4}\impliedby \textit{let's use an LCD of \underline{12}}\\\\
-------------------------------\\\\$

$\bf \cfrac{129}{4}-\cfrac{125}{6}\implies \cfrac{(3\cdot 129)+(2\cdot 125)}{12}\implies \cfrac{387-250}{12}\implies \cfrac{137}{12}
\\\\\\
\textit{hmmm 12 goes into 137, 11 times, thus}\quad \boxed{11\frac{5}{12}}
\\\\\\
\textit{because}\qquad \cfrac{11\cdot 12+5}{12}\implies \cfrac{132+5}{12}\implies \cfrac{137}{12}$

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Phoenix [80]

Answer:

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Step-by-step explanation:

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