李大妈把一笔钱存入银行,年利率3.5%存期三年到期可得利息4200元,问本金多少钱? 把10000元钱存定期一年,年利率为3.5%,到期可获得本金...
\u674e\u5927\u5988\u53bb\u5e74\u5230\u94f6\u884c\u5b58\u4e863000\u5143\u94b1\uff0c\u5b58\u671f\u4e09\u5e74\uff0c\u5e74\u5229\u73873%\uff0c\u5230\u671f\u540e\uff0c\u674e\u8001\u5e08\u53ef\u83b7\u5f97\u5229\u606f\u591a\u5c11\u94b1\uff1f3000\u00d73%\u00d73
=90\u00d73
=270\uff08\u5143\uff09
\u7b54\uff1a\u5230\u671f\u540e\u674e\u8001\u5e08\u53ef\u83b7\u5f97\u5229\u606f270\u5143\uff0e
10000+10000\u00d73.5%\u00d71\u00d7\uff081-20%\uff09
=10000+10000\u00d73.5%\u00d71\u00d780%
=10000+280
=10280\uff08\u5143\uff09
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绛旓細4涓囧厓鏈噾锛40000*3.5%*3=4200
绛旓細绛旓細鍒版湡鍚锛屾潕澶у鍙緱鍒╂伅180鍏
绛旓細50000+50000脳4.5%脳2=50000+50000脳0.045脳2=50000+4500=54500锛堝厓锛夛紱绛旓細鍒版湡鏃跺ス鍙互鍙栧洖鏈噾鍜鍒╂伅鍏54500鍏冿紟
绛旓細鏉庡ぇ濡堝皢10000鍏冪殑鍏昏侀噾瀛樺叆閾惰,瀛樻湡涓夊勾,骞村埄鐜囨槸5%.鍒版湡鍚,涓嶈冭檻鍒╂伅绋庯紝鏉庡ぇ濡堝彲浠庨摱琛屽彇鍒11500鍏
绛旓細绋庡悗鍒╂伅锛濇湰閲懨鍒╃巼脳瀛樻鏈熼檺脳锛1-绋庣巼锛夌◣鍚庡埄鎭紳50000脳3.33%脳2脳锛1-5%锛夛紳3163.5鍏 鏈伅鍜岋紳50000+3163.5锛53163.5鍏
绛旓細璁句笁骞村墠瀛樺叆浜哫鍏 3*2.7%*X*20%+X=1064.8 0.0162*X+X=1064.8 X(0.0162+1)=1064.8 X鈮1048 杩欎釜鍒╂伅鐜涔熷お楂樹簡鍚?
绛旓細10570-10000=570锛570/2=285,285/10000=2.85%,骞村埄鐜灏辨槸2.85%銆
绛旓細3000脳3%脳3 =90脳3 =270锛堝厓锛夌瓟锛氬埌鏈熷悗鏉庤佸笀鍙幏寰鍒╂伅270鍏冿紟
绛旓細鍥炵瓟濡備笅锛2004骞4鏈1鏃瀛樺叆浜烘皯甯20000鍏锛屽勾鍒╃巼4.14%锛2012骞4鏈1鏃ュ彇鍑猴紙鏁8骞存椂闂达級锛屽埄鎭20%銆傚鏋滅函鎸変竴閬撹绠楅鏉ヨ绠楃殑璇濓紝璁$畻鍏紡濡備笅锛1銆佸崟鍒╄鎭細20000*[1+4.14%*8*锛1-20%锛塢=25299.20鍏冦2銆佸鍒╄鎭細20000+20000*[锛1+4.14%锛塣8-1]*(1-20%)=26134.03鍏冦
绛旓細鈶犺В:璁骞村埄鐜涓篨銆2脳10000X 10000=10570鈥 20000X 10000=10570鈥20000X=10570-10000鈥20000X=570鈥=0.0285鈥=2.85