Riya spends 22% of her monthly income on rent and 18% on groceries. She then spends 20% of the remaining income on loan repayment and saves the rest. If her monthly saving is Rs. 19,200, find her monthly income.

ATQ, Let Riya’s monthly income be 100%. She spends 22% of her income on rent. She spends 18% of her income on groceries. Total amount spent on rent and groceries = 22% + 18% = 40% Remaining income after rent and groceries = 100% − 40% = 60% Now, she spends 20% of the remaining income on loan repayment. Remaining income = 60% of total income. So, loan repayment = 20% of 60% of total income. Loan repayment = 20 × 60/100 Loan repayment = 12% So, loan repayment is 12% of the total monthly income. Now calculate total expense. Total expense = Rent + Groceries + Loan repayment Total expense = 22% + 18% + 12% Total expense = 52% Saving = 100% − 52% Saving = 48% Given monthly saving = Rs. 19,200 So, 48% of monthly income = Rs. 19,200 Monthly income = 19,200 × 100/48 Monthly income = 19,200 × 25/12 Monthly income = 1,600 × 25 Monthly income = Rs. 40,000