The ratio is used for comparing two quantities of the sane kind.
The ratio formula for two numbers says a and b is given by a:b or a/b. When two or more such ratios are equal, they are said to be in proportion.
The concept of ratio and proportion is majorly based on ratios and fractions.
Solution:
From the question it is given that,
Monthly income of a man = ₹ $5,000$
Every month man saves ₹ $800$
(i) Annual expenses to annual income,
Annual income = monthly income $\times 12$
= ₹ $5,000\times 12$
= ₹ $60,000$
Then, monthly expenses = ₹ $5,000-800$
= ₹ $4,200$
Annual expenses = monthly expenses $\times 12$
= ₹ $4,200\times 12$
= ₹ $50,400$
Annual expenses/Annual income
Therefore, Annual expenses: annual income $=21:25$
(ii) Monthly savings to monthly expenses,
Monthly expenses = ₹ $5,000-$₹ $800=$ ₹ $4,200$
Then, monthly savings/monthly expenses
Therefore, monthly savings: monthly expenses $4:21$