You sell a smartphone that was originally priced at $600 but is now on sale for

total discount = 20%+10%=30%

original price of the smartphone = $600

30% of 600= 30/100*600

=180

so total discount is $180

The price after discount = 600-180=420 $

225 employees work as instructors.

Step-by-step explanation:

You want to find what 75% OF 300 is, therefore multiplication will be required in this problem. First you want to convert 75% to a decimal which you could do by just bringing the decimal point to the left twice. which will give you the decimal 0.75.

Now multiply. 0.75*300=225. There are 225 employees that work as instructors.