ATQ, Let's calculate the sale price first: The pen is marked for sale at a price 25% higher than the cost price: 
So, the net price of the pen after the discount is Rs 15.
16, 9, ?, 114.25, 750.625, 6396.3125
37, 57, 82, ?, 147, 187
What will come in place of the question mark (?) in the following series?
12, 13, 22, 47, 96, 177, ?
1, 6, 27, 124, ?, 3906, 27391
...60, 100, 160, 240, ?, 460
32 33 29 38 ? 47 11
...2 3 5 9 ? 33
...4, 6, 12, 30, ?, 315, 1260
842, 835, 821, 800, 772, ?
12, 33, 45, 78, 123, 201, ?
