Question

If the number of Conference participants decreases by 20% compared to last year, there would be 1760 participants this year. If the number of Conference participants increases by 25%, how many more participants would be there this year versus last year?

Answer 1

2,640 this year
2,112 last year

the 1760 is 20% less than - so 120% of 1760 is the previous year:
1760 * 1.2 = 2112

2112 increased by 25% is a total of 125%: 
2112 *1.25 = 2640

Answer 2

Step 1 - 1760 ÷ 0.8 = 2200 ⇒This represents the # of conference participants                       form last year (decreased by 20%)

Step 2 - 2200 × 1.25 = 2750 ⇒ This represents the # of conference participants from this year (increased by 25%)

Step 3 - 2750 - 2200 = 550 ⇒ This represents the difference between last year's and this year's # of conference participants