Question

Please help me, I need to get a good score on this test so bad.

Q1. In 1970 a desktop calculator sold for about %100.00. Today the same type of calculator sells for as little as $25.00. What is the percent of decrease in the cost of desktop calculators.

Q2. Find the percent of increase or decrease from the first number to the second number: 45 to 66

Q3 Marco makes $36,000 a year, if he receives a 5% raise, how much money will he be earning each year.

Q4 64 increased by 25%

Q5 Find the total cost: Price tax -$140.00 , Rate - 75$

Answer 1

1. (100 - 25) / 100...x 100
     75/100 = 0.75....x 100 = 75% decrease

2. (66 - 45) / 66....x 100
     21/66 = 0.318...x 100 = 31.8% increase

3. 36,000(1.05) = $ 37,800

4. 64(1.25) = 80

5. having trouble with this...what is the tax rate ? 75%...or 7.5%