\[ \text{Total days} = 365 + 30 = 395 \]
Since a week has 7 days, we divide:
\[ 395 \div 7 = 56 \text{ weeks with a remainder of } 3 \]
The remainder is 3, meaning we move 3 days forward from Tuesday:
Thus, 8th Dec 2017 falls on a Friday.
Arun’s present age in years is 40% of Barun’s. In another few years, Arun’s age will be half of Barun’s. By what percentage will Barun’s age increase during this period?