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property map does not exist on type observable angular 7

i got this error when add servese to my angular project 

also i got this error

cannot find angular/http

Separate decimal as currency

I stored my Currency as decimal in database , when it is shown in View of mvc, contain 2 decimal , for example 2000 show as 2000.00 ,but i want show this value as curency with separate 3 by 3 , I founded many string format in Internet , in continue i will show two of theme