Cobalt 60 has an annual decay rate of 13% how many grams of a 300 g sample one will remain after 20 years round the answer to two decimal places

18.51 grams.

Step-by-step explanation:

We have been given the decay rate

We have general equation for decay which is:

;

Here, we are given with initial sample which is a=300

b=1-13%

And t is 20 years.

We will subatitute the values in the formula we get:

After simplification we get y=18.51 grams.

The sample remain will be 18.51 grams.

the answer is 200

step-by-step explanation:

the way the question is worded, it seems to imply the $264 interest is simple interest, not compound interest.

the simple interest for 2 years is $264; the simple interest for 1 year is $132.

$132 interest on a $600 investment means an interest rate of (132/600)*100 = 22%.

the value of $200 at 22% interest compounded annually for three years is

200%281.22%29%5e3

the amount of interest is that value, minus the original $200.