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.
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Find the total amount of rent , correct  to the nearest dollar, for the first 18 months...'E3x;\Sp&ofQ
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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```
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r)Jj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
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[-Lq:q+L八度網上論壇之後果d你應該識啦

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]g4`5K.Pb\?S2T.tjforum.8cyber.com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K|j
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因為頭10個月唔應該計入條formula度

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用左了``同我頭先諗ge一樣= =forum.8cyber.com;ILF@J/M$M2E~
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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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張果條色=140441``不過都係計唔倒ge = =

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F({b%\8xforum.8cyber.com將頭９個月用sum of arithmetic series黎計.....;^jm
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(_q VYL{%z$vf@2r之後搵第10個月係乜....(相信你知用黎做乜)
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zW"e5T`(}F|forum.8cyber.com10-18個月就用sum of geometric series黎計.....forum.8cyber.com A%h1@h'\1e+c%th2T
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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= =``