Which pair of equations would correctly calculate their compound interests? jaina: a = 400 (1 + 0. 07) cubed, tomas: a = 300 (1 + 0. 04) cubed jaina: a = 300 (1 + 0. 03) superscript 7, tomas: a = 400 (1 + 0. 03) superscript 4 jaina: a = 400 (1 + 0. 03) superscript 7, tomas: a = 300 (1 + 0. 03) superscript 4 jaina: a = 300 (1 + 0. 07) cubed, tomas: a = 400 (1 + 0. 04) cubed.