借3万利率6.8%每月还多少利息合适？

借款3万，利率为年利率6.8%，每月还款利息计算如下：

每月利息 = 本金 × 月利率

月利率 = 年利率 / 12

年利率 = 6.8%

本金 = 30,000元

月利率 = 6.8% / 12 = 0.00567

每月利息 = 30,000元 × 0.00567 = 170.10元

因此，借3万元，利率为6.8%，每月还款利息为170.10元。

还款计划详解

以下是一个为期36个月的还款计划详解：

| 期数 | 本金 (元) | 利息 (元) | 还款额 (元) | 剩余本金 (元) |

|---|---|---|---|---|

| 1 | - | 170.10 | 170.10 | 30,000.00 |

| 2 | 1,055.45 | 164.65 | 1,220.10 | 28,944.55 |

| 3 | 1,055.45 | 159.11 | 1,214.56 | 27,889.10 |

| 4 | 1,055.45 | 153.45 | 1,208.90 | 26,833.65 |

| 5 | 1,055.45 | 147.66 | 1,203.11 | 25,778.20 |

| 6 | 1,055.45 | 141.76 | 1,197.21 | 24,722.75 |

| 7 | 1,055.45 | 135.74 | 1,191.19 | 23,667.30 |

| 8 | 1,055.45 | 129.59 | 1,185.04 | 22,611.85 |

| 9 | 1,055.45 | 123.33 | 1,178.78 | 21,556.40 |

| 10 | 1,055.45 | 116.94 | 1,172.39 | 20,500.95 |

| 11 | 1,055.45 | 110.44 | 1,165.89 | 19,445.50 |

| 12 | 1,055.45 | 103.82 | 1,159.27 | 18,390.05 |

| 13 | 1,055.45 | 97.08 | 1,152.53 | 17,334.60 |

| 14 | 1,055.45 | 90.23 | 1,145.68 | 16,279.15 |

| 15 | 1,055.45 | 83.27 | 1,138.72 | 15,223.70 |

| 16 | 1,055.45 | 76.20 | 1,131.65 | 14,168.25 |

| 17 | 1,055.45 | 68.99 | 1,124.44 | 13,112.80 |

| 18 | 1,055.45 | 61.67 | 1,117.12 | 12,057.35 |

| 19 | 1,055.45 | 54.24 | 1,109.69 | 11,001.90 |

| 20 | 1,055.45 | 46.70 | 1,102.15 | 9,946.45 |

| 21 | 1,055.45 | 39.05 | 1,094.50 | 8,891.00 |

| 22 | 1,055.45 | 31.29 | 1,086.74 | 7,835.55 |

| 23 | 1,055.45 | 23.43 | 1,078.88 | 6,780.10 |

| 24 | 1,055.45 | 15.45 | 1,070.90 | 5,724.65 |

| 25 | 1,055.45 | 7.38 | 1,062.83 | 4,669.20 |

| 26 | 1,055.45 | - | 1,055.45 | 3,613.75 |

| 27 | 1,055.45 | - | 1,055.45 | 2,558.30 |

| 28 | 1,055.45 | - | 1,055.45 | 1,502.85 |

| 29 | 1,055.45 | - | 1,055.45 | 447.40 |

| 30 | 447.40 | - | 447.40 | 0.00 |

| 31 | - | - | - | 0.00 |

| 32 | - | - | - | 0.00 |

| 33 | - | - | - | 0.00 |

| 34 | - | - | - | 0.00 |

| 35 | - | - | - | 0.00 |

| 36 | - | - | - | 0.00 |

从还款计划表中可以看出，每月还款额逐月递减，随着本金的逐渐归还，每月利息支出也会相应减少。在第30个月完成本金归还后，第31至36个月仅需支付利息。