[TYPO3-english] Calculations in typoscript

[Piotr Burda]

I have this TS
markers.master_input_wart = CONTENT
markers.master_input_wart {
     table = tx_pbjokapricelist_prices_full
     select {
     pidInList = 27
     orderBy = uid
     selectFields = uid, group_a_4_7
     # possible conditions
     where = ( tx_pbjokapricelist_prices_full.uid='1')
           }
       renderObj = COA
       renderObj {
           #value
           10.wrap =|
           10 = TEXT
           10.field = group_a_4_7
             }
}

The code works well, but i have problem when i try to mutiply the value  
"group_a_4_7", how to make mathematical operations on data form database  
table?

Regards Piotr
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