A one-year investment yields a return of 15%. The cash returned from the investment, including principal and interest, is $2,070. What is the interest?
A、$250
B、$270
C、$300
D、$310.50
A、$250
B、$270
C、$300
D、$310.50
【参考答案及解析】
$2,070 = 115% of the original investment ... Original investment = 1050/115x $2,070=$1,800 ...Interest = $2,070 - $1,800=$270 Option D is calculated (incorrectly) as follows. x/$2,070=15% ...x = 0.15 x $2,070 =$310.50 Make sure that you always tackle this type of question by establishing what the original investment was first.
$2,070 = 115% of the original investment ... Original investment = 1050/115x $2,070=$1,800 ...Interest = $2,070 - $1,800=$270 Option D is calculated (incorrectly) as follows. x/$2,070=15% ...x = 0.15 x $2,070 =$310.50 Make sure that you always tackle this type of question by establishing what the original investment was first.