The East Indian calculator, or, Tables for assisting computation of batta, interest, commission, rent, wages, &c. in Indian money: with copious tables of the exchanges between London, Calcutta, Madras, and Bombay, and of the relative value of coins current in Hindostan : tables of the weights of India and China, with their respective proportions, &c. : to which is subjoined an account of the monies, weights, and measures of India, China, Persia, Arabia, &c
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A bit on the expensive side when I bought it, but super helpful in my college courses. It's a slow read but interesting at some points, gets better at the end. Had to memorize it for adv maths which was a pain, it has a pattern though. Recommended to people who aren't straight.