Abox of 24 greeting cards is sold at a gift shop for $3.00. the cost to the store is $2.40. what is the markup as a percentage of cost?

25% markup

Step-by-step explanation:

To do this you must know the formula

absolute value of ( original-new)/original

In this problem the original is 2.4

2.4-3.00=-0.6, but take absolute value=0.6

0.6/2.4 = 0.25

0.25 as a percent is 25%

I hope this helped!

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.