A shopkeeper wants to earn 33% profit on an article after offering 30% discount. By how much percentage more he should mark the price of his article above cost price?
A bank offers 20% compound interest per half year. A customer deposits Rs 7600 each on 1st January and 1st July of a year. At the end of the year, the amount he would have gained from interest is
The difference of compound interest and simple interest for 3 years and for 2 years are in ratio 23 : 7 respectively. What is rate of interest per annum (in %)?