If a shopkeeper purchases a certain number of items for a certain sum and sells a fraction of the said number for the same amount, then his profit is 300%. What is the fraction?
\(\tfrac{1}{4}\)
\(\tfrac{1}{3}\)
\(\tfrac{1}{6}\)
\(\tfrac{1}{2}\)
The area (in cm2) of a sector of a circle of radius 2 cm is \(\frac{4\pi}{5}\). What is the central angle (in degrees) of the sector?