4. A store had $880,000 in sales during the Spring season last year, and is planning for $840,000 in sales for the coming Spring. a) What is the percentage decrease in planned sales? b) If the store's monthly plan for Spring is as follows: 15% in February, 17% in March, 18% in April, 20% in May, 23% in June...what percentage of sales will happen in July? c) According to the store's plan, what will be the dollar amount of sales in March