Eighteen per cent of country E's total requirement of iron ore is being met by imports from India. Next year its total requirement of iron ore is expected to fall by 22% and only 12% of the revised requirement will be imported from India. Assuming all other exports to country E by India remain at the same level, what would be its total percentage drop in quantity exports to E?

From the given question,

18% of E's Iron ore requirement = 32000 units

E's total Iron ore requirement = 32000 x (100/18) = 177777.78

E's requirement of Iron ore in 2011 = 78% of 177777.78 = 138666.6684

Only 12% of the revised requirement will be imported from India.

$$\therefore$$ Import of iron ore from India in 2011 = 16640

Total imports of E from India in 2010 = (32 + 29 + 48 + 2 + 3) = 114 x 1000 units 

Total imports of E from India in 2011 = 16640 + (29 + 48 + 2 + 3) x 1000  = 98640

Required drop in percentage is given by,

= $$\frac{114000 - 98640}{114000} \times 100$$

= $$\frac{15360}{114000} \times 100$$

= $$13.4$$%

Hence, option C is the correct answer.