Calculate the following upto proper significant figures :
(i) `45.95 xx 0.061`, (ii) `312.6 xx 14.68`
(iii) `3.2 + 4.004`, (iv) `515.69-312.812`
(v) `(6.7 xx 0.00421)/(11.8)`, (vi) `(5.4 xx 10^(-3) xx 0.0649)/(3.11 xx 10^(-2))`

Explanation

To solve the given problems, we will follow the rules of significant figures for each operation (multiplication, addition, subtraction, and division). Here’s a step-by-step breakdown of each part of the question:

### (i) Calculate `45.95 x 0.061`

1. **Identify significant figures**:
- 45.95 has 4 significant figures.
- 0.061 has 2 significant figures.

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