Round ₹53.80 to the nearest rupee.

₹53.80 → ₹54

Find 10% of ₹54.

1 / 10 × ₹54 = ₹5.40

Now add an extra half of that result. That will give you 15% of ₹54.

₹5.40 + 1/2 x ₹5.40 = ₹5.40 + ₹2.70 = ₹8.10

15% tip on a bill of ₹53.80 is approximately ₹8.10.

Compare your estimate to the exact answer:

Estimate: 15% of ₹53.80 ≈ 15% of ₹54 = ₹8.10

Exact answer: 15% of ₹53.80 = ₹8.07

Round ₹14.05 to the nearest rupee.

₹14.05 → ₹14

Find 10% of ₹14.

1/10 × ₹14 = ₹1.40

Now add an extra half of that result. That will give you 15% of ₹14.

₹1.40 + 1/2 x ₹1.40 = ₹1.40 + ₹0.70 = ₹2.10

15% tip on a bill of ₹14.05 is approximately ₹2.10.

Compare your estimate to the exact answer:

Estimate: 15% of ₹14.05 ≈ 15% of ₹14 = ₹2.10

Exact answer: 15% of ₹14.05 = ₹2.1075 → ₹2.11

Round ₹44.55 to the nearest rupee.

₹44.55 → ₹45

Find 10% of ₹45.

1 / 10 × ₹45 = ₹4.50

Now add an extra half of that result. That will give you 15% of ₹45.

₹4.50 + 1 / 2 x ₹4.50 = ₹4.50 + ₹2.25 = ₹6.75

15% tip on a bill of ₹44.55 is approximately ₹6.75.

Compare your estimate to the exact answer:

Estimate: 15% of ₹44.55 ≈ 15% of ₹45 = ₹6.75

Exact answer: 15% of ₹44.55 = ₹6.6825 → ₹6.68