Quantitative Aptitude - Arithmetic Ability Questions

If a+b-62+a2b2+1+2b=2ab+2a, then the value of a is 

The compound interest earned in two years at 8% per annum is Rs 4160. What is the sum (in Rs) invested?

If cosπ/4c - tanπ/4c = x, then x is

If 2r = h + r2+h2, then the ratio of r:h is

A discount series of 15%, 20% and 25% is equal to the single discount of?

Find the perimeter (in cm) of a semicircle of radius 28 cm.

Which of the numbers given below is the square root of 14161?

A wholesaler sells a watch to a retailer at a gain of 20% and the retailer sells it to a customer at a loss of 10%. If the customer pays Rs 874.8, what had it cost the wholesaler?