A toy manufacturer recently introduced a new computer game. Management is interested in estimating future sales volume to determine whether it should continue to carry the new game or replace it with another game. At the end of April, the average monthly sales volume of the new game was 500 games and the trend was +50 games per month. The actual sales volume figures for May, June, and July are 560, 600, and 620, respectively. Use trend-adjusted exponential smoothing with α = 0.2 and β = 0.1 to forecast usage for June, July, and August.