"A shopkeeper has 3   varities of pens `' A^(prime),\ ` `' B '` and `' C '` . Meenu purchased
Channel: Doubtnut
Date: 2020-06-28

"A shopkeeper has 3
 
  varities of pens `' A^(prime),\ `
 `' B '`
 and `' C '`
 . Meenu purchased 1 pen
 
  of each variety for a total of Rs 21. Jeen purchased 4 pens of `' A '`
 variety, 3 pens of `' B '`
 variety and 2 pens of `' C '`
 variety for Rs 60.
 
  While Shikha purchased 6 pens of `' A '`
 variety, 2 pens of `' B '`
 variety and 3 pens of `' C '`
 variety for Rs 70.
 
  Using matrix method find the cost of each pen."