The interest of $4000 in 2 years is 500. what is the simple interest rate?

0.0625/year or 6.25%/year

Step-by-step explanation:

Simple interest formula:

We are given these values:

We want to find r, the simple interest rate.

Substitute these known values into the formula.

The simple interest rate is 0.0625, aka 6.25% per year.

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

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