rainlight design studio had sales in the last four months of $13,700,15,400,17100,$ and $18,800.$ Sales are related to how many designers rainlight has on duty. The sales forecast helps rainlight decide on the proper staffing levels. What is the forecast for the fifth month using a weighted three month mocing average using $\mathrm{.}50$ for the fourth month $\mathrm{.}3$ for the third month and $\mathrm{.}2$ for the second month