If the simple interest on $2000 for 2 years is $320, then what is the interest rate?

Answer : The interest rate is, 8 %

Step-by-step explanation :

Given:

Principle = $2000

Simple interest (S.I) = $320

Time = 2 years

Now we have to determine the interest rate.

Formula used :

where,

P = principle  

R = interest rate

T = time

S.I = simple interest

Now put all the given values in the above formula, we get:

Thus, the interest rate is, 8 %

answer: the answer is (b) amie should have multiplied

step-by-step explanation: given a sphere and a cylinder with same radius and height.

let, 'r' be the radius of the cylinder and sphere and 'h' be the height of the cylinder. according to the question,

r = h.

now, the volume of the sphere will be

and the volume of the cylinder will be

therefore, we have

thus, ammie should have multiplied the volume of the sphere