ch 7 prealgebra

What is 45% as a simplified fraction? (no calc)

• $\frac{9}{20}$

• $\frac{3}{20}$

• $\frac{45}{100}$

• $\frac{9}{10}$

 $\frac{6}{25}\ as\ a\ percent?\$  (no calc)

• 6%

• 18%

• 24%

• 0.24%

42.5% as a decimal (no calc)

• 4.25

• 0.425

• 42.5

• .0425

0.017 as a percent? (no calc)

• 17%

• 0.17%

• 0.0017%

• 1.7%

Which proportion corresponds to the following statement? 'What number is 24% of 95?' (no calc)

• $\frac{x}{100}=\frac{24}{95}$

• $\frac{x}{95}=\frac{100}{24}$

• $\frac{95}{x}=\frac{24}{100}$

• $\frac{x}{95}=\frac{24}{100}$

Which equation corresponds to 'what percent of 70 is 31.5?' (no calc)

• $p\%\cdot31.5=70$

• $p\%\cdot70=31.5$

• $31.5\cdot70=p\%$

• $31.5\%\cdot p=70$

An investment of $1500 at interest rate r will earn $120 over 2 years. What is the interest rate?

• 4%

• 0.04%

• 25%

• 2.5%

Batman sold a used Batarang on a superhero website. They charged him $20 plus 4.5% of the final selling price. Batman paid the website $42.50. How much did the Batarang sell for?

• $200

• $1000

• $500

• $1500

Pick the correct equation for the following statement, '30 girls and some boys answered a survey. 45% of them prefer orange Gobstoppers to yellow. 15 students prefer orange.'

• .30(45+x)=15

• 0.45x+30=15

• 0.30x+45=15

• 0.45(30+x)=15

Jack must correctly answer 75% of the questions on an exam to move on. He already correctly answered 30 and incorrectly answered 5. How many of the remaining 15 questions must he correctly answer to move on?

• 9

• 6

• 7

• 8