Converting kB and GB to MB in bash

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Im using awk and sed to get a list of partitions in table with their size, which I want to use to calculate the daily increment for individual tables. This is the output I have, now Im struggling to convert all of the sizes to MBs.

What would be the best bash way to match the number in the second field and multiply it depending on the "MB" or "GB" string

2017061505,482.46MB,hdfs://user/hive/warehouse/cz_prd_ntw_op.db/diameter__24_/pr_comp_ver=0/pr_start_time=2017061505,
2017061505,722.58MB,hdfs://user/hive/warehouse/cz_prd_ntw_op.db/diameter__24_/pr_comp_ver=0/pr_start_time=2017061506,
2017061507,1.03GB,hdfs://user/hive/warehouse/cz_prd_ntw_op.db/diameter__24_/pr_comp_ver=0/pr_start_time=2017061507,
2017061507,1.25GB,hdfs://user/hive/warehouse/cz_prd_ntw_op.db/diameter__24_/pr_comp_ver=0/pr_start_time=2017061508,

The desired output would be:

2017061505,482.46MB,hdfs://MORPHEUS/user/hive/warehouse/cz_prd_ntw_op.db/diameter__24_/pr_comp_ver=0/pr_start_time=2017061505,
2017061506,722.58MB,hdfs://MORPHEUS/user/hive/warehouse/cz_prd_ntw_op.db/diameter__24_/pr_comp_ver=0/pr_start_time=2017061506,
2017061507,1030MB,hdfs://MORPHEUS/user/hive/warehouse/cz_prd_ntw_op.db/diameter__24_/pr_comp_ver=0/pr_start_time=2017061507,
2017061508,1250MB,hdfs://MORPHEUS/user/hive/warehouse/cz_prd_ntw_op.db/diameter__24_/pr_comp_ver=0/pr_start_time=2017061508,
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