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900
Step-by-step explanation:
Given that each tape costs Rs 375,
Given that 18 desks costs as much as 5 tapes
=> Cost of 18 desks = Cost of 5 tapes
= 5* 375 = 1875 Rs.
Cost of 1 desk will be = 1875/18
= 625/6 Rs.
Given 25 boards costs as much as 15 desks
=> Cost of 25 boards = Cost of 15 desks
= 15*625/6
= 3125/2
So, Cost of 1 board will be = 3125/50
= 125/2 Rs
Given that 10 chairs cost as much as 12 boards
=> Cost of 10 chairs = Cost of 12 boards
= 12*125/2
=Rs 750
So, Cost of 1 chir will be = 750/10
= Rs 75.
Cost of 1 dozen chairs will be
= 75 * 12
=Rs 900.
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