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標題:

Maths x 1(THX)(form 2)

發問:

1.if the cost price and the selling price of a computer are$C and $S respectively,the profit per cent x% can be calculated by the following formula:x=100(S-C)/Ca)make C the subject of the formulab)If x=10 and S+16000 ,find the vale of Cc)if the selling price of a computer is $15000 and the profit percent is... 顯示更多 1.if the cost price and the selling price of a computer are$C and $S respectively,the profit per cent x% can be calculated by the following formula: x=100(S-C)/C a)make C the subject of the formula b)If x=10 and S+16000 ,find the vale of C c)if the selling price of a computer is $15000 and the profit percent is 25%,find the cost of 2 computers THX~~~!!!

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(A) x=100(S-C)/C Cx=100S-100C Cx+100C=100S C(x+100)=100S C=100S/(x+100) (B) C=100*16000/(110)=160000/11大約$14545.45 (C) S=$15000,x=25 C=100*15000/125=12000 then cost of 2 computers=$24000

其他解答:

a)make C the subject of the formula x=100(S-C)/C x= (100S-C)/C Cx=100S-C Cx+C=100S C(x+1)=100S C= 100S /(x+1) b) the value of C C=100(16000)/(10+1) C=1600000/11 C= 145454.545(corr to 3 sign. figures)