Ivan has 50 x 10 = <<50*10=500>>500 cents from the 50 dimes in his one piggy bank.
So, he has a total of 100 + 500 = <<100+500=600>>600 cents in one of his piggy banks.
Since 100 cents is equal to 1 dollar, then Ivan has 600/100 = 6 dollars from one of his piggy banks.
Therefore, Ivan has a total of $6 x 2 piggy banks = $<<6*2=12>>12 from his two piggy banks.
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