The corn dealer's assistant [electronic resource] : consisting of tables ready calculated, to shew at one view, the amount of any quantity of grain, from one quarter to 500, and so on; at all the various prices, from 5 Shillings to 4 l. per Quarter, advancing by 3 d. to which is added, one Table to shew what any Quantity of Grain amounts to, from 1 Quarter to 500, from one Halfpenny to two Pence Halfpenny, very useful for Farmers, Corn Factors, Brewers, Distillers, Malsters &c. Calculated and Re-Examined from the Press, by John Hewitt, Profess'd Accomptant, Author of the Tables upon Simple Interest, &c.