Ravi has 6 + 2 = <<6+2=8>>8 quarters.
He has also 8 + 4 = <<8+4=12>>12 dimes.
A nickel is worth 5 cents so Ravi's nickels amount to 6 x 5 = <<6*5=30>>30 cents.
A quarter is worth 25 cents so his quarters amount to 8 x 25 = <<8*25=200>>200 cents.
A dime is worth 10 cents so his dimes amount to 12 x 10 = <<12*10=120>>120 cents.
therefore, Ravi has 30 + 200 + 120 = <<30+200+120=350>>350 cents.
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