Question

17. A wooden bookshelf has external dimensions as follows:
Height -110cm, Depth -25cm, breadth -85 cm. The thickness
of the planks is 5 cm everywhere. The external faces are
to be polished and the inner faces are to be painted. If the
rate of polishing is 20 paise per square cm and the rate of
painting is 10 paise per square
A. External surface area will be -
(1) 12100 cm2 (ii) 8500 cm2 (iii) 32100 cm2 (iv) 19100 cm2
B. Internal surface area will be -
(i) 14500cm2 (ii) 2900 cm2 (iii) 16000cm2 (iv) 1500cm2
C. Total expenses will be -
(i) Rs 5240
(ii) Rs 4810 (iii) Rs 2940 (iv) Rs 1710
D. Difference of cost of painting to cost of polishing is -
(i) Rs 1105 (ii) Rs 990 (iii) Rs 4520 (iv) Rs 720
E. Ratio of External surface area to Internal surface area is-
(i) 145:191 (ii) 290:105 (iii) 23:25
(iv) 11:17
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Answer 1

Answer:

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Step-by-step explanation:

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