Arrey, rounding is just like me rounding off monthly school fees in my head! For nearest 10, look at the ones digit; if it’s 5 or more, round up. For 100, look at the tens digit. My life says the obvious "round down to save" is wrong—I always round *up* estimates for my son's expenses, because a "saved" 50 rupees is actually the chemist's bill hiding in my purse.
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