Now, subract the new number(45) from the old number. (35)
45-35 is 10. Now divide the old number (35) by 10. You'll get 3.5. 3.5%, increase is the answer for #1.
2.) Old: s (students) New: 36,750
Do 100+5 (Addition because we do not know what the old number is.) 100+5 is 105. Move decimal over twice and you get 1.05. Multiply 36,750 by 1.05. There were 38,587.5 kids last year.
3.)Since the discount is 15% off, do 100-15=85. Now, move the decimal over from the percent, and that makes that .85. Now multiply 50x.85. You get 42.5, or $42.50. Now the coupon is 10%, So subtract 100-10, giving you 90. Now move the decimal over. .90. Multiply 42.5 (or 42.50) by .90. You get 38.25. You do have enough money.
4.) Subtract 100-15, giving you 85. Move decimal over from percent. .85. Now you would multiply .85 times k. B should be the answer.
So for number one it's a finding a percent of change. you can find the by doing the change divided by the original, then multiply that answer by 100. the change is 10, divided by the original 35, equals about 0.285. 0.285 times 100 is 28.5 so they increased their score by about 28.5% :) hope that's right and i hope it helps!!
