A tank with rectangular base and rectangular sides

MATHEMATICS · Subjective · AP · Calculus AB · Analytical Applications of Differentiation · Analytical Applications of Differentiation

Problem

6. A tank with rectangular base and rectangular sides, open at the top is to be constructed so that its depth is 2 m and volume is

8 \mathrm{~m}^{3}

. If building of tank costs Rs 70 per sq metres for the base and Rs 45 per square metre for sides. What is the cost of least expensive tank?