The rent of a shop is $6000 for the first month .  It increases by $200 per month for the next 9 months, and then increases by 3% per month for the subsequent month.R
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Find the total amount of rent , correct  to the nearest dollar, for the first 18 months...
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ps```前幾part計左ge野``` the rent of 10th month $7800```total amount of the first 10months $69000```the rent of the 11th month $ 8034```八度網上論壇*d{+P#X_
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果part唔色計了```ans係140441``不過唔知點計出黎的``

首先,你要明第12個月點計,之後你就會明Z7X0^,f,y3nZ#p+F
7800x 1.03^2=8275.02
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]之後果d你應該識啦

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我知可以咁計呀= =不過我有能力相信我咁做會俾人打`7Kn@X0I
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coz佢仲有條formula 係```Sn=a(r^n - 1) / (r-1)``}2bq0v*W/m#j~

        gn5erqfLforum.8cyber.com但係我代極都計唔倒呀汗``

車...你又唔講....

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唔好意思呢汗= =咁點計呀xd``N ~_CH+Hg&Q
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我用6千又唔得``7千8又唔得= =唔知點乘了= =

應該係用7千8forum.8cyber.com        O&c{sz
因為頭10個月唔應該計入條formula度

j,^1VRH6L用左了``同我頭先諗ge一樣= ='VcK4P
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出黎係69360.22```加埋頭10個月果69000``都係得138360``係唔夠數ge==

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你不如寫你打d野出黎scan左佢先-=-

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你要邊part ar= =我問果part俾我塗晒喎 ==

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我頭先用左個好愚蠢ge方法去計= =``9@*L        gT
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a%u1l_w%O3Z8fh張果條色=140441``不過都係計唔倒ge = =

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Q將頭９個月用sum of arithmetic series黎計.....#a8v(Y%t+e8u3UG8ub
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之後搵第10個月係乜....(相信你知用黎做乜)dxJW"zo`

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u7FO八度網上論壇10-18個月就用sum of geometric series黎計.....
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將兩個數加埋~~~就係你既答案.....不過有小數點.....應該係140441.0278..........

我計到個答案出黎...不過如果係咁咁第10個月咪加2次@@

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要用8034黎計呀汗= =``