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6) Principal+ interest = amount
7)Profit percentage=profit/cost price ×100
8)2:5=10:25
9)3:7; 6:14 ; 9:31
10) we know 1 week=7 days
So, 3/7×100
=300/7
=42 6/7%
11) let the fourth term be x
A/c:-
6:8=15:x
=>6x=15×8. { Cross multiplication}
=>x=20