Please solve step by step all the sections that need to be answered in the question.

Season George Kyparisis owns a company that manufactures sailboats. Actual demand for George's sailboats during each of the past four seasons was as follows: Year D 1 2 3 4 Winter 1.400 1,280 1,080 960 Spring 1,500 1,440 1,640 1,500 Summer 1,040 2.100 2.040 1,900 Fall 600 770 650 520 George has forecasted that annual demand for his sailboats in year 5 will equal 6,000 sailboats. sailboats (enter a whole Based on the given data and using the multiplicative seasonal model, the demand level for George's sailboats in the spring of year 5 will be number)