Question 161970
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Since dimensions of the wall is given and only the wall needs to be white washed,then get AREA of the wall times the rate.
{{{A[w]=L*W=4.5m*3.6m=16.2m^2}}}
{{{Cost=Area*Rate}}}
{{{C=(16.2cross(m^2))*(20rs/cross(m^2))}}}
{{{C=324rs}}} ANSWER
Thank you,
Jojo</pre>