Given,
Compound rate, R = 10% per annum
Time = 2 years
C.I = Rs. 420
Let P be the required principal.
A = (P+C.I)
Amount, A = P1 + r100n

(P+C.I) = P1 + 101002

(P+420) = P[11/10][11/10]

P-1.21P = -420

0.21P = 420

Hence, P = 420/0.21 = Rs. 2000

The Qutub Minar in New Delhi was lit up in blue as part of World Autism Day on 2 April.

The design plans for the U-shaped skyscraper ‘The Big Bend’ in New York, hailed as the world’s longest building, have been revealed. The 4,000-foot long building will feature an elevator system that can travel in curves, horizontally and in loops.

Chief Minister of Andhra Pradesh, N Chandrababu Naidu has been selected for another prestigious award. The US India Business Council has selected the CM for award of ‘Transformative Chief Minister’ and Naidu would be receiving coveted award at second annual West Coast summit which to be held in California on May 8, 2017.

India’s P.V. Sindhu avenged her Rio Olympic final defeat to Spain’s Carolina Marin in an emphatic style with a straight game 21-19, 21-16 win in the women’s singles final of India Open Super Series at a packed Siri Fort Sports Complex on 2 April 2017.

– It is worth mentioning that Sindhu had lost to Marin the Rio Olympic women’s singles final. But she avenged her Olympic final defeat to Marin in an imperious fashion with a straight game. This was Sindhu’s first India Open Super Series title.

“Rashtriya Vayoshri Yojana” was launched by the Ministry for Social Justice and Empowerment on 1 April 2017 at Nellore (Andhra Pradesh). Under the scheme, physical aids and assisted-living devices for senior citizens were distributed to senior citizens belonging to below poverty line (BPL) category.

– The scheme has been implemented through the sole implementing agency – Artificial Limbs Manufacturing Corporation (ALIMCO), a public sector undertaking. The aids to be distributed under the “Rashtriya Vayoshri Yojana” scheme include walking sticks, elbow crutches, walkers, tripods / quadpods, hearing aids, artificial dentures and spectacles.

– The ambitious scheme, first of its kind in the country, is expected to benefit 5,20,000 Senior citizens over a period of the 3 years.

As clear from the figure itself, triangle OQX and triangle O'PX are similar.

So,

OQ/O'P = OX/O'X

=> OX = (7/9)xO'X

And since, OX + O'X = 20

=> (7/9)xO'X + O'X = 20

=> O'X = 45/4