Answer: 64:25

Explanation:
Let us assume that the production of wheat in 1998 is 8000 and
Therefore the export of wheat in 1998 is 1500
The total production in the given five years
8000 x 100 / 20 = 40000
Total export in the given five years = 1500 x 100 / 10 = 15000
Production of wheat in 1999 = 9600
Export of wheat in 1999 = 3750
Required ratio = 9600/3750 = 64/25

Answer: 512

Explanation:
Given, export of wheat in 1999 = 200 million tones
Total export in five years = 200 x 100 / 25 = 800 million tones
Export in 1998 = 80 million tones
Production of wheat in 1998 = 80 x 16/3
= 426.67
Total production in the five years
426.67 x 100 / 20 = 2133.33
Production of wheat in 1999 = 2133.33 x 24 / 100 = 512

Answer: 28.12

Explanation:
Production of wheat in 1997 = 4000 x 20/100 = 8000
Export of wheat in 1997 = 1500 x 15/100 = 2250
Required % = 2250/8000 x 100 = 28.12%

Answer: 140%

Explanation:
Explanation: Required % (24 – 10) / 10 x 100 = 140%

Answer: None of these

Explanation:
Given, production of wheat in 1998
Export of wheat in 1998 = 1272 x 3/16 = 238.5
Export in 1997 = 238.5 x 1.5
357.75 million tones.