We will discuss here how to calculate the sales tax in a bill.

1. Jack bought the following electrical items from a shop.

Fans Lamps Switches Tubes Electric wire |
4 2 dozens 5 dozens 6 230 metres |
$ 675 each $ 110/Dozen $ 41/Dozen $ 135 each $ 2.50/ metre |

If the sales tax is charged at the rate of 7% on all these items, find the total amount paid by Jack.

**Solution:**

Cost of 4 fans = $ (675 x 4) = $ 2,700

Cost of 2 dozen lamps = $ (110 x 2) = $ 220

Cost of 5 dozen switches = $(41 x 5) = $ 205

Cost of 6 tubes = $(135 x 6) = $ 810

Cost of 230 meter of wire = $ (2.50 x 230) = $ 575

Therefore, the total cost of all items = $ 2,700 + $ 220 + $ 205 + $ 810 + $ 575 = $ 4,510

Therefore, sales tax at the rate of 7% = $ (4510 x \(\frac{7}{100}\)) = $ 315.70

Therefore, total amount paid by Jack = $ 4,510 + $ 315.70 = $ 4,825.70

**2.** Richard bought the following goods from a departmental store.

Cosmetics Medicines
Bakery products Stationery |
$ 450 $ 250
$ 103 $ 185 |
10% 8%
Nil 5% |

Find the total amount Richard had to pay for the commodities. How much did she pays as sales tax.

**Solution: **

For cosmetics; here, the marked price P = $450, the rate of sales tax = 10%, i.e. r = 10

Therefore, S = P(1 + \(\frac{r}{100}\))

⟹ S = $ 450 × (1 + \(\frac{10}{100}\))

= $ 450 × (\(\frac{11}{10}\))

= $ 495

For medicines; here, the marked price P = $250, the rate of sales tax = 8%, i.e. r = 8

Therefore, S = P(1 + \(\frac{r}{100}\))

⟹ S = $ 250 × (1 + \(\frac{8}{100}\))

= $ 250 × (\(\frac{27}{25}\))

= $ 270

For bakery products; here S = P = $ 103, as there is no sales tax

For stationery; here, the marked price P = $185, the rate of sales tax = 5%, i.e. r = 5

Therefore, S = P(1 + \(\frac{r}{100}\))

⟹ S = $ 185 × (1 + \(\frac{5}{100}\))

= $ 185 × (\(\frac{21}{10}\))

= $ 194.25

Therefore, the total amount paid = $495 + $270 + $103 + $ 194.25 = $ 1062.25

The total amount of sales tax paid = ($495 - $450) + ($270 - $250) + 0 + ($ 194.25 - $ 185)

= $45 + $20 + 0 + $9.25

= $74.25

**● Sales Tax and Value Added Tax**

**Calculation of Sales Tax****Sales Tax in a Bill****Mark-ups and Discounts Involving Sales Tax****Profit Loss Involving Tax****Value Added Tax****Problems on Value Added Tax (VAT)****Worksheet on Printed Price, Rate of Sales Tax and Selling Price****Worksheet on Profit/Loss Involving Sales Tax****Worksheet on Sales Tax and Value-added Tax****Worksheet on Mark-ups and Discounts Involving Sales Tax**

**10th Grade Math****From Sales Tax in a Bill to HOME PAGE**

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