tolong bantu jawab no 30 dan 31

No. 30
r alas = 40cm , t prisma = 60cm
K segi lima = 5x40 = 200cm
K total = 2x200 = 400cm
5x60 = 300cm
Total = 400+300 = 700cm = 7m
Biaya  = 7x25000 = 175000 (B)

No. 31
p kolam = 24m , l kolam = 9m
L kolam = pxl
               = 24x9
               = 216m^2
L kolam dan beton = pxl
                                 = 26x11
                                 = 286m^2
L beton saja = L kolam dan beton - L kolam
                      = 286-216
                      = 70m^2
Biaya = 70x200000 = 14000000 (D)