left！！！not spent! So you need to calculate the fraction of left money. Then use T*F=C 
(2) Eddie had 120 dollars as his pocket money, and spent $$ \frac{3}{4} $$of it. How much money is left? 
Options:
[a] $$30$$ 
[b] $$60$$ 
[c] $$90$$ 
[d] $$120$$ 