1. (a) Mr. R.K. Nair gets Rs 6,455 at the end of one year at the rate of 14% per annum in a recurring deposit account. Find the monthly instalment.   2. (b) A = {x : 11x − 5 > 7x + 3, x ∈ R} and B={x : 18x − 9 ≥ l5+12x, x ∈ R}. Find the range of Set A ∩ B and represent it on a number line.   3. (c) In the given figure, AB and DE are perpendicular to BC. If AB = 9 cm, DE = 3 cm and AC = 24 cm, calculate AD.