We can do 90*(100/60) to figure out which number is 90 when it is only 60 percent. This means the original number was 150. Now we just do 150/5 which equals 30. Then we can multiply 30*4 = 120.
L.S.A.=1/2pl where p represents the perimeter of the base and l the slant height. L.S.A. = ½(4*32)(24) L.S.A. = ½ (128)(24) L.S.A. =1/2(3072) L.S.A. = 1536 cm