The cost price and the markedprice of an itemare ₹720 and ₹900 respectively. Whenit is sold at a discount of x%, the profit is $$\frac{5x}{3}\%$$, what is the value of x ?

A

$$5\frac{5}{7}$$

B

$$5\frac{4}{7}$$

C

$$7\frac{4}{7}$$

D

$$8\frac{4}{7}$$