Salary of a person decreases by 10% every year and his bonus increases by 24% every year. If his salary and bonuses at the end of 2020 were ₹ 8000 and ₹ 2500 respectively, find the difference between his total earnings in March 2020 and March 2022.

​In a group of 40 people, 25 people speak Hindi and 20 people speak both Hindi and Urdu. All the people speak at least one of the two languages. How many people speak only Urdu?​

IN a certain code language 'GERMANY' is coded as 9, 7, 20, 15, 3, 16, 27. How 'FRANCE' will be coded in this language? 

A person takes a loan of Rs. 5000 at 5% simple interest. He returns Rs. 3000 at the end of one year.
How much he would have to pay, in order to clear his dues, at the end of 2 years?

The interest earned on 8000 when invested in some scheme for 2 years at 7 % simple interest, per annum is half of the interest earned on another amount P invested for five years in the same scheme at the same rate of interest. Find the value of P.

Which of the following statement(s) is/are true?
A. Speed of x m/sec is equal to $$x \frac{5}{18}$$ km/hr.
B. If a train runs at $$\frac{5}{6}$$​ of its usual speed. it gets late by 10 minutes. The usual time of the train to cover the journey is 40 minutes.
C. A car moves at the speed of 80 Km/hr. The speed of the car in meters per second is $$22 \frac{2}{9}$$​.
D. A person crosses a 600 rn long street in 5 minutes. The speed of the person in Krn per hour is 7.2.
Choose the correct answer from the options given below:

Find the wrong term in the series given below:
3, 12, 36, 144, 432, 1738, 5184

For different sets of datasets X and Y. correlation coefficient between X and Y, that is R and standard deviation of X and Y, that is, S(X) and S(Y) are given in A-D below. Estimate the covariance between X and Y for each dataset and arrange in ascending order.
A. R= 0.5,     S(X)= 8,     S(Y)= 10
B. R= 4/7,     S(X)= 7,     S(Y)= 9
C. R= 0.7,     S(X)= 12,     S(Y)= 5
D. R= 19/42, S(X)= 14,     S(Y)= 6
Choose the correct answer from the options given below:

​If $$V_1 , V_2$$ a volumes and $$S_1 ,S_2$$  are the surface areas of two cubes then​

​In a school survey of 400 students 100 were taking apple juice, 150 orange juice and 75 were taking both apple and orange juice. How many students were taking neither apple nor orange juice?​

​If the mean of x, y and z is K, then the mean of $$\frac{x}{y},\ 1,\ \frac{z}{y}$$​​