The marked price of one pen is '₹x'. The selling price of one packet of 'x' pens, after a discount of 15%, is ₹1,360. What is the value of 'x'?

40

Let the MRP of one packet of x pens is y.

According to the question,

y of (100-15)% = 1360

y of 85% = 1360

y = 1600

The marked price of one pen is '₹x'.

MRP of one packet of 'x' pens = marked price of one pen × number of pens in one packet

y = x × x

Put the value of y in the above equation.

1600 = x × x

x² = 1600

x = 40