a) $$ {\frac{x}{{100y \times \left( {1 – z} \right)}}} \,{\text{days}}$$
b) $$ {\frac{{100yz}}{x}} \,{\text{days}}$$
c) $$ {\frac{{100x}}{{\left( {100 – z} \right)y}}} \,{\text{days}}$$
d) $$\frac{{100}}{{y \times \left( {z – 1} \right)}}\,{\text{days}}$$
Answer: c
Explanation:
$$\eqalign{
& {\text{Daily}}\,{\text{supply}} \cr
& = \left( {100 – z} \right)\% \,{\text{of}}\,y \cr
& = \frac{{ {\left( {100 – z} \right)y} }}{{100}} \cr
& {\text{Required}}\,{\text{number}}\,{\text{of}}\,{\text{days}} \cr
& = {\frac{{ {100x} }}{{\left( {100 – z} \right)y}}} \cr} $$
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