27. In 1950, the world grain production was approximately 600 million tons. In 1994, the world grain harvest had risen to 1800 million tons. In 1995, it fell to 1600 million tons. Calculate the percentage increase in grain production over the period 1950-1995.

166.67%

Explanation:

The computation of the percentage increase in grain production for the period 1950-1955 is shown below:

= (Year 1995 grain production - Year 1950 grain production) ÷ ( Year 1950 grain production)

= (1,600 million tons - 600 million tons) ÷ (600 million tons)

= 1,000 million tons ÷ 600 million tons

= 166.67%

Hence the increase in percentage is 166.67%

it would take 95 years for that supernova to be visible on earth, so the year would be about 2113. i hope i did my calculation right.