Please only answer if you have knowledge of game theory , if not please dont reply.. i need accurate answer, it is very urgent and important

At a company, 20 employees are making contributions for a retirement gift. Each of the 20 employees is choosing how many dollars to contribute from the interval [0,20]. The manager of these 20 employees announces that she will contribute d dollars for every dollar that an employee contributes. The payoff to employee i who makes contribution of xi dollars is bi(1+d)xixi,wherebi>0 Assume that d=4,bi=0.25 for i=1,2,,10, and bi=0.5fori=11,12,,20 What is the best contribution level of any employee i for i=11,12,,20. Numerical