Question 990297
The rate for 15 laborers is:
{{{ 67500/9 = 7500 }}}
The rate for 1 laborer is:
{{{ 7500/15 = 500 }}}
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[ rate in rs/day ]x{ days ]x[ number of laborers ] 
{{{ 500*12*10 = 60000 }}}
Rs 60000