The table lists the unit selling price of five products $P, Q, R, S$, and $T$. On a particular day, 250 items were sold with the average selling price of Rs. 60. The following observations were made:

(i) The quantity of S sold was twice that of T .

(ii) The quantity of R sold was thrice that of T .

(iii) The quantity of $Q$ sold was four times that of $T$.

$$ \begin{array}{|c|c|c|c|c|c|} \hline \text { Product } & \text { P } & \text { Q } & \text { R } & \text { S } & \text { T } \\ \hline \text { Unit selling price(Rs.) } & 100 & 50 & 40 & 60 & 60 \\ \hline \end{array} $$

What is the quantity of product $P$ sold on that day?

Consider a string P of length $l$ that is laid out as a straight-line segment. Another string K is laid out as a semicircular arc with string P as its diameter, as represented in Figure (i). When both the strings are shortened by a length $x$ they can be re-arranged such that the shortened string K forms a full circle with the shortened string P as its diameter, as represented in Figure (ii). The value of $x / l$ is $\_\_\_\_$

How many combinations of non-null sets A, B, C are possible from the subsets of {2, 3, 5} satisfying the conditions: (i) A is a subset of B, and (ii) B is a subset of C?