Preprogrammed with financial and accounting functions, the Texas Instruments BA-35 solar scientific calculator is perfect for compound interest and time-value-of-money calculations. This Texas Instruments scientific calculator runs on solar power so you don’t need to change batteries. Furthermore, interest conversions from annual percentage rate to effective rate can be easily done on the Texas Instruments BA-35 solar scientific calculator. Moreover, the protective slide case keeps the Texas Instruments scientific calculator safe form accidental damages.