Option 4 : A(1 + C/100) – X(1 + D/100)

**GIVEN:**

Firoz's monthly salary = A

Expenditure = X

Salary in second month = A + C% of A

New Expenditure = X + D% of X

**FORMULAE USED:**

Savings = Salary - Expenditure

**CALCULATION:**

Amount saved = (A + (C × A)/100) - (X + (D × X)/100)

= A(1 + C/100) – X(1 + D/100)