With Solar Plus and Tax Calculations, this handheld calculator is the perfect tool for traveling professionals. It provides a large 10-digit display for excellent readability. Functions include tax calculations, independent memory, profit margin percentage, change sign (+/-), percent key, grand total, key rollover, decimal selector (floating or fixed 0, 1, 2, 3, 4) and ADD mode. Calculator with plastic keys operates on solar power with battery backup.