4.04 Percentages with technology
Use a calculator to express the following as percentages:
\dfrac{15}{8}
\dfrac{581}{700}
\dfrac{291}{485}
\dfrac{357}{680}
44 out of 64
899 out of 725
5.9 out of 0.32
76 out of 91.2
Use a calculator to convert the following into decimals:
\dfrac{33\,100}{25}\%
9.25\%
51\% \times 83\%
70\% of 617
135\% \times 24.6
\dfrac{67.2}{24}
\dfrac{3}{4} of 65.86
72\% \div 3
Use a calculator to find the following:
23\% of \dfrac{54}{17}
91.6\% of 97.3
317\% of \dfrac{23.6}{8}
126\% of 87.2
209\% of \dfrac{29}{22}
47.3\% of 1.764
Use a calculator to determine x in each of the following:
70\% of x is equal to 42.7
60\% of x is equal to 39.54
60.1\% of x is equal to 24.04
46\% of x is equal to 35.88
Give some examples of when it might be quicker not to use a calculator in percentage calculations.
A city has a yearly water supply of 27\,000\,000 megalitres. It gets 14\% of this water supply from melted snow. Find the amount of water that comes from melted snow each year.
A bag of potatoes weighs 50\text{ kg}. When more potatoes are added, the weight of the bag increases by 35\%.
Find the added weight in the bag of potatoes.
Find the new weight of the bag of potatoes.
Duncan is going to buy a hat that is marked as 25\% off. The original price was \$30.
Find the discount amount.
Find the discounted price that Duncan will pay for the hat.
Ryan scored 60\% on her Maths exam, which was marked out of 110. What was Ryan's actual mark out of 110?
The 64 girls at Victoria's party represent 80\% of all the guests.
How many guests represent 10\% of all the guests?
Find the total number (100\%) of guests at the party.
A music store advertises 12\% off in all CDs and DVDs. A CD is normally priced at \$18.
Find the amount of the discount on this CD.
Find the discounted price of the CD.