Common Mistakes : Cash

noun

.BAD: I prefer to pay by cash
.GOOD: I prefer to pay in cash
.GOOD: I prefer to pay cash

pay by cheque , pay by credit card BUT pay in cash or just pay cash
.If you pay (in) cash, you might get a discount

.BAD: The purse contained about $200 cash
.GOOD: The purse contained about $200 in cash

‘amount of money + in cash : ‘£550 in cash’, ‘$190 in cash