Original price $45 mark down 22% ?

An item that costs $45, when discounted 22 percent, will cost $35.1. The easiest way of calculating discount is, in this case, to multiply the normal price $45 by 22 then divide it by one hundred. So, the discount is equal to $9.9. To calculate the sales price, simply deduct the discount of $9.9 from the original price $45 then get $35.1 as the sales price.

2^y = ln 5, or   y(ln 2) = ln 5.   solving for y,   y = (ln 5) / (ln 2).   y=5

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