Answer:
30.6
Explanation:
Your answer is correct to three decimal places not three significant figures.
Three decimal places: Three numbers after the decimal
Three significant figures: first 3 digits (NB: if the number starts with zero, you only include the numbers after zero, E.g: 0.043262 to three significant figures would be 0.0433 because the zeros don't count. However, if the zero is at the end or in between non zero numbers, it is included. E.g: 1.201 to three significant figures would be 1.20).