Express 57,00,000 and 8,04,30,000 in scientific notation.

To write a number in scientific notation, we move the decimal point so that there is only one non-zero digit to the left of the decimal point. The number of places the decimal point is moved determines the exponent of 10.
For 57,00,000:
The decimal point is initially at the end of the number (57,00,000.).
Move the decimal point to the left until it is after the first non-zero digit (5).
5.700000
The decimal point moved 6 places to the left.
So, $57,00,000 = 5.7 \times 10^6$.

For 8,04,30,000:
The decimal point is initially at the end of the number (8,04,30,000.).
Move the decimal point to the left until it is after the first non-zero digit (8).
8.0430000
The decimal point moved 7 places to the left.
So, $8,04,30,000 = 8.043 \times 10^7$.

The numbers in scientific notation are:

(i) \boxed{\text{5.7 \times 10^6}}

(ii) \boxed{\text{8.043 \times 10^7}}