Fill in the boxes: 1 rupee + 1 rupee = rupees, 5 rupees + 5 rupees = rupees, 10 rupees + 10 rupees = rupees, 20 rupees + 5 rupees = rupees, rupees + 5 rupees = 10 rupees, 10 rupees + rupees = 20 rupees, 20 rupees + rupees = 25 rupees, 50 rupees = 20 rupees + 20 rupees + rupees, 50 rupees = 10 rupees + 20 rupees + rupees, 30 rupees = 20 rupees + 5 rupees + rupees.

Step 1: Fill in the boxes by performing the addition or subtraction.

• For $1 rupee + 1 \text{ rupee}$: $1 + 1 = \boxed{2}$
• For $5 rupees + 5 \text{ rupees}$: $5 + 5 = \boxed{10}$
• For $10 rupees + 10 \text{ rupees}$: $10 + 10 = \boxed{20}$
• For $20 rupees + 5 \text{ rupees}$: $20 + 5 = \boxed{25}$
• For $\boxed{\phantom{5}} rupees + 5 rupees = 10 \text{ rupees}$: $10 - 5 = \boxed{5}$
• For $10 rupees + \phantom{10} rupees = 20 \text{ rupees}$: $20 - 10 = \boxed{10}$
• For $20 rupees + \phantom{5} rupees = 25 \text{ rupees}$: $25 - 20 = \boxed{5}$
• For $50 rupees = 20 rupees + 20 rupees + \phantom{10} \text{ rupees}$: $20 + 20 = 40$ $50 - 40 = \boxed{10}$
• For $50 rupees = 10 rupees + 20 rupees + \phantom{20} \text{ rupees}$: $10 + 20 = 30$ $50 - 30 = \boxed{20}$
• For $30 rupees = 20 rupees + 5 rupees + \phantom{5} \text{ rupees}$: $20 + 5 = 25$ $30 - 25 = \boxed{5}$