A rectangular cross-section of a reinforced concrete beam is shown in the figure. The diameter of each reinforcing bar is 16 mm. The values of modulus of elasticity of concrete and steel are \( 2.0 \times 10^4 \, \text{MPa} \) and \( 2.1 \times 10^5 \, \text{MPa} \), respectively.

The distance of the centroidal axis from the centerline of the reinforcement (in mm, round off to one decimal place) is \(\underline{\hspace{1cm}}\).
Consider a five-digit number PQRST that has distinct digits P, Q, R, S, and T, and satisfies the following conditions:
1. \( P<Q \)
2. \( S>P>T \)
3. \( R<T \)
If integers 1 through 5 are used to construct such a number, the value of P is:


