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2 years ago

On a deposit of $100 at a simple interest rate of 20%, How many years would it take to double your money?

Mathematics

1 answer:

borishaifa [10]2 years ago

8 0

Answer:

5 years

Step-by-step explanation:

Formula to calculate simple interest

Where:

A = Future amount = 2(100)

P = Principal Amount = 100

r = Rate of Interest per year in decimal

r = R/100 = 20/100 = 0.2

To find,

t = Time Period

Put value in the formula

200 = 100(1 + 0.2t)

200/100 = (1 + 0.2t)

2 = (1 + 0.2t)

2 - 1 = 0.2t

1 = 0.2t

1/0.2 = t

t = 5 years

So, it will take 5 years to double money.

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2 years ago

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rotation of 90 degrees counterclockwise about the origin, point O, then a reflection across the x-axis reflection across the y-a

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Answer:

The point O can be (x,y) or (-x,y) or (-x,-y) or ( x,-y) reason being that you haven't given point O lies in which quadrant.

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(x,y) = (-y,x)

(-x,y)=(-y,-x)

(-x,-y)=(y,-x)

(x,-y) =(y,x)

Then Reflection across X axis has taken place.

(-y,x) = (-y,-x)

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(y,-x)=(y,x)

(y,x)=(y,-x)

Then a reflection across the y-axis has taken place.

(-y,-x)=(y,-x)

(-y,x) = (y,x)

(y,x) =(-y,x)

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Then a translation a units to the right and b units up has taken place.

(y,-x)=(y+a,-x+b)

(y,x) =(y+a, x+b)

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[-(-y+a),-(x+b)]=[(-y+a),-(x+b)]

[-(-y+a),-(-x+b)]=[(-y+a),-(-x+b)]

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