Calculation of SPI and CPI:
Suppose in a given semester a student has taken four courses having credits C1, C2, C3 and C4 and
grade points in those courses are G1, G2, G3 and G4 respectively. Then,
SPI = (C1 x G1 + C2 x G2 + C3 x G3 + C4 x G4) / (C1 + C2 + C3 + C4)
CPI = (SPI1 x Credits in semester1 + SPI2 x Credits in semester2 + ...) / (Total credits)
For example, if in a given semester a student has taken four courses having credits 6, 6, 6, and 8
and grade points in those courses are 10, 9, 8, 6 respectively. Then,
SPI = (6 x 10 + 6 x 9 + 6 x 8 + 6 x 6) / (6 + 6 + 6 + 8) = 7.62