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3 3/4 = 12/4 + 3/4 = 15/4
sombreros:
3*13/5 = $39/5
camisas:
6*15/4 = $90/4
camisas + sombreros:
(39/5) + (90/4) = (156/20) + (450/20) = (156+450)/20 = 606/20
606/20 = 600/20 + 6/20 = 30 + 3/10 = 30.3
gastaste, por todo, $30.3
al pagar con un billete de $50
50-30.3 = 19.7
Respuesta:
devuelven:
$19.7