Enter the number of inquiries needed, then enter the expected response rate.  The Calculator returns the number of mailings needed to generate the desired number of inquiries.  To calculate the cost per inquiry for this mailing, enter the cost per 1,000 mailings.  You can experiment by entering different numbers to see how they affect the number of mailings needed and the cost per inquiry.  Enter the number you want to use in the cell.  Enter response rates percentages as a whole number with decimal point (e.g., 1.25 % as  1.25).