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Three types of tea costing sh203,sh146 and sh197 per kg are blended in the ratio of 2:5:k. Find the value of k,if the blend when sold at sh221 per kg gives 30% profit

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130% =221
100% = ?
22100 =sh 170
     130
  2   (203) +   5    (146)  +  K    (197)  =170
7+k              7+k               7+k
406+730+197k =170(7+k)
      1136+197k =1190+170k
                 27k = 54
                      k=2

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