A number is first decreased by 40% and then increased by 40%. The equivalent change is :

1. nothing

2. 16% increase

3. 16% decrease

4. 8% increase

Out of 700 eggs, 20% are rotten. The number of good eggs is :

1. 140

2. 560

3. 680

4. 840

A number 80 is wrongly taken as 100. The percentage error is :

1. 20%

2. 25%

3. $\dfrac{100}{80}\times 100\%$

4. $\dfrac{80}{100}\times 100\%$

The price of an article was ₹ 680 last year. This year its price is ₹ 816. The percentage change in the price is :

1. (816 - 680)% increases

2. (816 - 680)% decreases

3. $\dfrac{816 - 680}{680}\times 100$% increases

4. $\dfrac{816 - 680}{816}$% increases