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 -$140.00 , rate - 75$