Are you saying that $1050 was the initial amount of money in the savings account? If so then you'd find 84% of 1050, which is 1050*.84. (.84 is the decimal version of 84%)
Question not clear, it could be: he spend 84% which was $1050 or He spend 84% of 1050, 2 answer below
ANSWER 1 if he spend 84% of 1050 then he has 100-84=16% left percnet means parts out of 100 so 16%=16/100=1.6/10=0.16 'of' means multiply so 0.16 times 1050=168 he had 168 dollars left
OR
ANSWER 2 so if he spend 84% of his money to buy a costume and he spend 1050 84%=1050 so solve for remaining remaining=100-84=16%
if 1050=84% then solve for 16% so set up a ratio and proportion 1050/84%=x/16% so therefor (note: equivilent fracitons when multiplied make 1/1 so exg 1/4=2/8 so 1/4 times 8/2=8/8=1)
so 84%/1050 times x/16%=1=84x/16800 1=84x/16800 multiply boht sides by 16800 16800=84x divide both sdies by 84 200=x $200 left in bank account
