An item is regularly priced at $70. It is on sale for 60% off the regular price. What is the sale price?

answer:  $28.00

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Step-by-step explanation:

You want to buy something that costs $70, and it's on sale for 60% off. What is the item's sale price?

First, convert the 60% to a real mathematical number. For percents, this is always done by dividing the 60% by 100%, or 60% / 100% = 0.600.

Second, find out what 60% of $70 is. This is the amount of the sale discount. This is always found by mulitplying 0.600 by the item's cost $70, like this:

0.600 x $70 = $42.00.

So for this sale, you'll save $42.00 on this item.

This means, the cost of the item to you is

$70 - $42.00 = $28.00.

47 - 90 = 43

43 - 180 = x

x = 137

e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation: