`p.w. = `(1760 - 160)` `= Rs. 1600` `:. S.l. on Rs. 1600 at`12%` is Rs. 160`. `:. Time = ((100 xx 160)/(1600 xx 12))` `= 5/6 years` `= (5/6 xx 12) months ` `= 10 months