Can someone please give me an example on how to solve these using the table and functions below? I just cannot figure out how to do it with the t's! Thank you in advance.

	2018	2019
Sales	$10,000	$15,000
Cost of Sales	$14,000	$18,000
Accounts Receivable	$8,000	$21,000

Day's sales in receivables: (Accounts Receivable t/ Sales t)/( Accounts Receivable t1/ Sales t1)= (Accounts Receivable t/ Sales t ) / (Accounts Receivable t1/ Sales t1 ) Index for manipulators: 1.5 to 1 Gross margin: [( Sales t1 - Cost of Sales t1)/ Sales t1]/[( Sales t - Cost of Sales t)/ Sales t]= Index for manipulators: 1.2 to 1 Sales growth: Sales t / Sales t-1 Manipulators: 1.6 Non-manipulators: 1.10