Hamlet

Note Book Summary

(7.2)

Ratio:

A ratio is a comparison of two numbers. You generally separate the two numbers in the ratio with a colon (:). Suppose you want to write the ratio of 8 and 12. You can write this as 8:12 or as a fraction 8/12, and we say the ratio is eight to twelve.

Fraction:

There are different ways of writing a fraction. For example, two fifths of an object can be written as:

A common fraction

A decimal 0.4

A percentage 40%

Decimals:

A decimal is a proper fraction whose denominator is a power of 10. To convert a fraction into a decimal:

Divide the denominator (the bottom part) into the numerator (the top part):

? = 1 ч 4.00 = 0.25

Percents:

Percent is a ratio of a number to 100. A percent can be expressed using the percent symbol %.

10 percent or 10% are both the same, and stand for the ratio 10:100.

(7.3)

Percent of a Number:

To find the percent of a number write the percent as a decimal and then multiply by the number.

45% of 200

= o.45 x 200

= 90

(7.5)

Discount and Sale Price:

A discount is a reduction in the cost of an item. The sale price of an item is its regular price minus the discount.

Discount: 40% off a shirt at $49.50 = 19.8

Sale Price: 40% off a shirt at $49.50 - $19.80 = $29.70

(7.6)

GST (7%) & PST (8%):

The Goods and Services Tax (GST) is a federal government tax. The rate is the same for all provinces.

The Provincial Sales Tax (PST) is a rate determined by each province. In some provinces, the PST is calculated on the selling price only. In other provinces, the PST is calculated