A cell phone originally priced at $120. The store owner gives a discount and the cell phone is now priced at $90. What is the percentage discount for the cost of the cell phone?

The answer to your question is 25%

Step-by-step explanation:

Data

Original price = $120

Price after discount = $90

Discount = ?

Process

1.- Consider that the original price is the 100%  and use a rule of three to find the percent of discount

                           $120 100%

                             $90 x

                             x = (90 x 100) / 120

                             x = 9000 / 120

                             x = 75%

2.- Calculate the percent of discount

$90 represents 75% of the original price, then,

       Percent of discount = 100 -75

                                         = 25 %              

b. 6

step-by-step explanation:

we are given the table representing an exponential function.

we can see from the table that, as x is increasing, the value of y is increasing in the power of 6.

i.e. the following relation is obtained,

x = 1, y = 6

x = 2, y = 36 =

x = 3, y = 216 =

x = 4, y = 1296 =

x = 5, y = 7776 =

so, the geometric series obtained is .

thus, the common ratio is given by = = 6.

hence, the common ratio is 6.

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step-by-step explanation:

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