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Holding the key down for three seconds will cause the date or time to flash, this is the program mode. 12. r RAT El TAX Rate Preset Key Used to enter TAX rate. 13. fTAX 11 Tax 1 Key Calculate an amount of tax with tax rate preset by [RATE] key. Use [+=] key for calculating an amount including VAT, and [-=] key for calculating an amount excluding VAT. 14. fTAX 21 Tax 2 Key Calculate an amount of tax with tax rate preset by [RATE] key. Use [+=] key for calculating an amount including VAT, a