11 Winter’s method is being used to forecast quarterly U.S. retail sales (in billions of dollars). At the end of the first quarter, Lt  300, Tt  30, and the seasonal indexes are as follows: quarter 1, 0.90; quarter 2, 0.95; quarter 3, 0.95;

quarter 4, 1.20. During the second quarter, retail sales are

$360 billion. Assume a  0.2, b  0.4, and g  0.5.

a At the end of the second quarter, develop a forecast for retail sales during the fourth quarter of the year.

b At the end of the second quarter, develop a forecast for the second quarter of the following year.