The company receives application money for 15,000 shares, which is
15,000×5=75,000. For 10,000 shares, the application money is
10,000×5=50,000. The excess application money is
75,000−50,000=25,000. The allotment money required for 10,000 shares is
10,000×10=100,000. Therefore, the additional money needed is
100,000−25,000=75,000.