12-digit calculator with a kickstand features an easy-to-read, angled LCD for convenient viewing whether you're working at home or in the office. Answer check function lets you know when the calculation being checked matches the results of the previous calculation. Cost-sell-margin keys allow fast, simple profit margin calculations. Twin-power operation runs on solar energy with a battery backup to deliver consistent, reliable use in any environment. Executive business calculator also includes percent key, sign change key, auto power off, double-zero key, grand total key, rounding switch and more.12-digit calculator with a kickstand features an easy-to-read, angled LCD for convenient viewing whether you're working at home or in the office. Answer check function lets you know when the calculation being checked matches the results of the previous calculation. Cost-sell-margin keys allow fast, simple profit margin calculations. Twin-power operation runs on solar energy with a battery backup to deliver consistent, reliable use in any environment. Executive business calculator also includes percent key, sign change key, auto power off, double-zero key, grand total key, rounding switch and more.