Amina saves 16% of her income. Now her income is increased by 20% but she still saves the same amount as before. What is the percentage increase in her expenditure?

Sure, let's break it down:

1. Let's assume Amina's initial income was $100 (we can use any amount, but$100 makes the percentages easy to calculate). So, she was saving 16% of $100, which is$16.

2. Now, her income is increased by 20%. So, her new income is $120 ($100 + 20% of $100).

3. Even though her income has increased, she still saves the same amount as before, which is $16.

4. Her initial expenditure was the difference between her income and her savings. So, it was $100 -$16 = $84.

5. Her new expenditure is the difference between her new income and her savings. So, it's $120 -$16 = $104.

6. The increase in her expenditure is the difference between her new expenditure and her initial expenditure. So, it's $104 -$84 = $20.

7. To find the percentage increase in her expenditure, we divide the increase by the initial amount and then multiply by 100. So, it's ($20 /$84) * 100 = approximately 23.81%.

So, the percentage increase in Amina's expenditure is approximately 23.81%.