Question

your employer has 600 business cards printed for you and you give away 280 of them to the nearest hundred what percent of the cards is left

Answer 1

First, find the number of cards that is left. 600 - 280 = 320.

Now find what percent of 600 320 is. This can be done like so:
$\frac{280}{600}$ · 100%

This gives us 46.67 % (rounded to the nearest hundredth).