In a combined test in Maths and Chemistry, 84% candidates passed in Maths, 76% in Chemistry and 8% failed in both. Find :

(i) the percentage of failed candidates.

(ii) if 340 candidates passed in the test, then, how many candidates had appeared in the test ?

A's income is 25% more than B's. Find out by how much percent is B's income less than A's ?

If the price of sugar is increased by 25% today, by what percent should it be decreased tomorrow to bring the price back to the original ?

A number increased by 15% becomes 391. Find the number.