Final answer:
Rojina spent 72.72% of her monthly salary with her expenditure of Rs.40000 out of a monthly salary of Rs.55000.
Step-by-step explanation:
To find the percentage of Rojina's expenditure, we need to use the following formula:
Percentage of Expenditure = (Expenditure / Total Salary) × 100%
In Rojina's case, her expenditure for the month is Rs.40000 and her monthly salary is Rs.55000. Therefore, the calculation will be:
(Rs.40000 / Rs.55000) × 100% = (0.7272...) × 100% = 72.72%
Rojina spent 72.72% of her monthly salary.