GST calculations (calculation of multiple tax rates, calculating price-plus-tax, price-less-tax, and tax grand totals, calculating the price-plus-tax, price-less-tax, and tax subtotals for each tax rate (recall mode)), 5 independent GST keys, total GST/tax slab grand total, rounding and decimal selector, Indian comma marker, grand total, 200 steps check and correct, plastic keys, extra large display, 12 digit