The volume of a prism is 960 cm3. If its base area is 80 cm2, by what percentage should the height be increased to make the volume 1200 cm3?
25%
Volume of a prism = base area × height.
Present height = 960 ÷ 80 = 12 cm; required height = 1200 ÷ 80 = 15 cm.
Increase = 15 − 12 = 3 cm, so percentage increase = \(\frac{3}{12} \times 100\) = 25%.
Hence, the height should be increased by 25%.
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