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Let the sale of sweets in this week be 100 of them.

Therefore, the sale during last week was less by 20%

First let us calculate 20% of 100

$\dfrac{{20 \times 100}}{{100}} = 20$

As last week’s sale is less than 20% i.e. 20, we subtract it from 100.

Therefore, last week’ sale = $100 - 20 = 80$ sweets

Now we have to calculate how much this week’s sweet sale is more than that of last week.

Last week’s sale was 80 sweets and this week’s sale was 100 sweets.

So, this week’s sale is more than that of last week by $100 - 80 = 20$ sweets.

Now, as we are comparing this increase in number of sweets from last week the percentage increase will be

$

= \dfrac{{(100 - 80)}}{{80}} \times 100 \\

= 25\% \\

$