標題:
tax ''
發問:
the chan family usually uses 40m^3 of water every four months. last month, they had a newborn baby. Mr. chan estimates that the consumption for the next water bill will be 60m^3. Find the percentage increase of the water bill. (Give the answer correct to the nearest integer.) 更新: Units of comsumption charge per m^3 on the first 12m^3 Free on the next 31m^3 $4.16 on the next 19m ^3 $6.45 Remainder $9.05
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最佳解答:
the chan family usually uses 40m^3 of water every four months. last month, they had a newborn baby. Mr. chan estimates that the consumption for the next water bill will be 60m^3. Find the percentage increase of the water bill. (Give the answer correct to the nearest integer.) Units of comsumption charge per m^3 on the first 12m^3 Free on the next 31m^3 $4.16 on the next 19m ^3 $6.45 Remainder $9.05 original water bill=12*0+(40-12)*4.16 =$116.48 new bill=12*0+31*4.16+(60-12-31)*6.45 =238.61 % change =(238.61-116.48)/116.48*100% =+105%( corr to nearest integer.)
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