If sec2 α + 4 cos2α = 4 and 0° ≤ α ≤ 90°, then find the value of α.
The difference between Simple Interest & Compound Interest for the fourth year is Rs 7280 at 20% per annum. What is the principal amount.
An increase of 20% in the price of mangoes enables a person to purchase 4 mangoes less for Rs 40. The price of 15 mangoes before increase was
A tradesman gives 4% discount on the marked price and gives 1 article free for buying every 15 articles and thus gains 35%. The marked price is increased above the cost price by
What will the value of the sum of Rs 537000 if it is increased by 10% then further increased by 17% and finally reduced by 10% ?