Sagot :
Solution:
[tex]Percentage Increase = \frac{(Final Value - Initial Value)}{Initial Value} * 100\\\\= \frac{(400 - 300)}{300} * 100\\\\= \frac{100}{300} * 100\\\\= 0.3333 * 100\\\\= 33.33[/tex]
Final Answer:
Donna's weekly allowance increased by 33.33%