A businessman’s earning increases by 25% in one year but decreases by 4% in the next. After 5 years his total earnings would be Rs. 72,000. What is the present earning?

What is the sum of first 14 natural numbers?

$$ {I.2x^{2}-{9x}+10=0}$$
$$ {II.2y^{2}-13y+20=0}$$

If the sum of first three natural numbers from a group of six consecutive natural numbers is 36, then the sum of last three natural numbers will be? 

The single discount which is equivalent to three successive discounts of 25%, 20% and 10% is-

The difference between compound interest and simple interest on a sum of money for 3 years at 8% per annum is Rs. 354.80. Find the sum.

ABCD is cyclic quadrilateral and O is the center of the circle. If ∠COD = 140^o and ∠BAC= 40^o, then the value of ∠ BCD is equal to-

On selling 17 balls at Rs. 720 there is a loss equal to the cost price of 5 balls. The cost price of a ball is: