Round off the following numbers upto three significant figures.
(i)2.520 , (ii)4.645 , (iii)22.78 , (iv)36.25

Options

A. `2.sqrt2,4.65,22.7,36.3`
B. `2.sqrt2,4.64,22.8,36.4`
C. `2.50,4.64,22.7,36.3`
D. None of the above

Answer

B

Explanation

(i) 2.520:Since 0 is less than 5, preceding digit is left unchanged. Hence, 2.52.
(ii)4.645: Since the digit to be droped is 5 and the preceding digit 4 is even. Hence 4.64.
(iii) 22.78: Since the digit to be dropped is 8 and greater than 5, therefore the preceding digit 7, is raised by 1. Hence, 22.8.
(iv) 36.35:Since the digit to be dropped is 5 and the preceding digit 3 is odd, we acn write the answer as 36.4.