engineering managment / forcasting

A certain retail store has used a trend projection model to forecast its sales for the next 4 quarters. This trend projection model is constructed based on the historicat data of the sales of each quarter for the last 3 years which have been found as: Y=380,000+13,500X.X=quarterNa Seasonal indices for the 4 quarters have been found to be 0.83,77,0.92 and 1.2 respectively. (Note: find the second seasonal index by yourself). Forecast the retail sales for second quarter of the next vear by using the multiplicative seasonal model including trend