MATH 110 Lecture Notes - Lecture 5: Percentage Point
Document Summary
Math 110 lecture 5 percents; comparing; conversion. Percent decrease: new value = old value x (1 r) where r is the percentage rate, and the new value is less than the old value. Example: a cd costs . 99 with an extra 20% off. Find the sale price. x = 17. 99 x (1 - . 2) x = 17. 99 x (. 8) x = 14. 39. Percent increase: new value = old value x (1+ r) where r is the percentage rate, and the new value is greater than the old value. Find your new salary. x = 54,000 x (1 + . 035) x = 54,000 x (1. 035) x = 55,890. Percentage point is the difference between 2 percents. Example: 3 percentage points is the difference between 6% and 9%. Find the percentage points for the following percentages. A can of raisins costs . 78 for 20 oz. A box of raisins costs . 25 for 17 oz.
