Royal College, Colombo 07 Grade 11 Maths Term 1 Test 2022

Import duty at a percentage on an item's value

Answer: Rs 1540

💡 What it's asking: Customs duty is a percentage of the item's value. Find 22% of Rs. 7000.

1. 1Write 22% as 22/100.
2. 2Multiply: 7000 × 22/100 = 70 × 22.
3. 370 × 22 = Rs. 1540.

✅ 20% of 7000 is 1400, and 22% should be a bit more: 1540 fits.

Evaluate a negative power plus an integer

Answer: 28/9 = 3 1/9

💡 What it's asking: A negative index means 'one over'. Change 3⁻² to a fraction, then add 3.

1. 1A negative power means take the reciprocal: 3⁻² = 1/3².
2. 23² = 9, so 3⁻² = 1/9.
3. 3Add 3: 1/9 + 3 = 3 1/9, which is 28/9.

✅ 3⁻² is a small positive number (not negative), so the answer is just a little more than 3. ✓

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