Three prismatic bars, two of material A and one of material B, transmit a tensile load P ( see figure). The two outer bars (material A) are identical. The cross- sectional area of the middle bar (material B) is 31.544% larger than the cross- sectional area of one of the outer bars. Also, the modulus of elasticity of material A is twice that of material B. What fraction of the load P is transmitted by the middle bar? (Express your answer in percentage points).